Catalytic converters have been in widespread use in North American vehicles since the 1970s. Their purpose is to make car exhaust from internal combustion engines less toxic, converting substances ...Aug 4, 2023 · Palladium has a price of $2,049 per ounce or $65 per gram. Platinum has a price of $977 per ounce or $31 per gram. On average, a catalytic converter contains 3-7 grams of platinum, 2-7 grams of palladium, and 1-2 grams of rhodium. Speaking purely in numbers, that’s at least $700 in precious metals alone, but there’s a catch. The average catalytic converter has 3 to 7 grams of platinum worth about $100 – $237. Platinum is more valuable than gold, silver, and even palladium and is a good target for thieves. As of 2022, the platinum price is $997 per ounce and $32.18 per gram. Keep in mind the platinum price constantly fluctuates. A catalytic converter uses a set of catalysts to convert some of the dangerous gases produced by your car into benign substances. There are three primary metals that are used inside of converters as well as other materials. Mar 4, 2022 · SUVs and Pickups are most likely to have their catalytic converter stolen even though their converters are not costly. Their price is less than $50. Honda Vans, Toyota Priuses, and U-Haul are prone to converter theft. Such vehicle owners should park them in a well-lit parking lot and install cameras for security purposes. National Catalytic Converter Average. Average price for catalytic converters in the US. VIEW METAL DETAILS. $82.02/each. Large Foreign Cat. Larger foreign sized cat. GET QUOTE. VIEW METAL DETAILS. $76-$456/each.The organization blames the under-vehicle crime wave on much higher prices for the valuable metals inside catalytic converters. One metal, rhodium, has skyrocketed to about $28,000 an ounce ...Feb 13, 2022 · A catalytic converter is part of your car’s exhaust system that converts harmful engine-exhaust pollutants into something less harmful to the environment. A catalytic converter is part of your... Here are some ways to find the catalytic converter serial number by car model: 1. GM. General Motors labels most catalytic converters the same way across the entire lineup, whether you have a Chevy, GMC or Cadillac. In most cases, the plate will show eight numbers, which is the serial code.Dec 26, 2022 · A catalytic converter is an exhaust emission control device of your vehicle that is responsible for reducing the amount of pollutants and toxic gases from the exhaust gas. Exhaust gas is the result of the internal ignition of the engine of a vehicle. It contains a lot of pollutants and toxic gases that harm the environment after coming out ... Palladium has a price of $2,049 per ounce or $65 per gram. Platinum has a price of $977 per ounce or $31 per gram. On average, a catalytic converter contains 3-7 grams of platinum, 2-7 grams of palladium, and 1-2 grams of rhodium. Speaking purely in numbers, that’s at least $700 in precious metals alone, but there’s a catch.Compare the flow to a similar car if possible. 3. High or low fuel consumption. Better or worse gas mileage is one of the symptoms of a poor catalytic converter. While better gas mileage may sound like a good deal, it can damage your engine and may cause even more expensive repairs.4. Cut The Exhaust Pipes Off Your Scrap Car. When you are prepping your catalytic converter for the scrap yard we mentioned above, do not remove the honeycomb, but you also want to make sure you keep the shell of the catalytic converter on. However, on either end of it are the exhaust pipes. These can be removed and cut as close to the shell as ...A catalytic converter uses a set of catalysts to convert some of the dangerous gases produced by your car into benign substances. There are three primary metals that are used inside of converters as well as other materials. Mar 20, 2017 · California legal catalytic converters will comply with CARB labeling requirements. If an aftermarket catalytic converter does not comply with CARB labeling requirements, the vehicle will not pass a California smog inspection, and a smog certificate will not be issued. Pre-OBD II Vehicles (Model year 1995 and older): A catalytic converter is an exhaust emission control device of your vehicle that is responsible for reducing the amount of pollutants and toxic gases from the exhaust gas. Exhaust gas is the result of the internal ignition of the engine of a vehicle. It contains a lot of pollutants and toxic gases that harm the environment after coming out ...Mar 20, 2017 · California legal catalytic converters will comply with CARB labeling requirements. If an aftermarket catalytic converter does not comply with CARB labeling requirements, the vehicle will not pass a California smog inspection, and a smog certificate will not be issued. Pre-OBD II Vehicles (Model year 1995 and older): Mar 3, 2021 · The value of the part. Catalytic converters are made of three different metals that hold a pretty steep price tag. Two of the metals, palladium and rhodium, are worth more per ounce than the price ... Feb 15, 2023 · That said, replacing a catalytic converter can cost anywhere between a few hundred dollars to well over two thousand. The average cost is typically between $900 and $2,500, depending on the situation. It’s best to visit multiple well-respected mechanics and get several estimates to find the best price in your area. Mar 9, 2023 · Additionally, the height of the vehicle makes it easier for thieves to reach the catalytic converter. With less time needed to get the job done and a good payday ahead, these are some of the most targeted vehicles. Ford F-250 and Toyota Tacoma are two great examples of this. 3. Luxury Cars. According to data from 2020, the most expensive catalytic converter belonged to the Ferrari F430, with a mind-popping $3,770.00 price tag. Moreover, the F430 needed two of them, so a full replacement would run car owners $7,540 before labor costs. While the Lamborghini Aventador’s converter is technically the third most expensive, at $3,120 ...Jul 11, 2019 · What year did catalytic converters become mandatory? The average automobile was a toxic chemical factory before catalytic converters became government-mandated equipment in 1972. Oxides of nitrogen and lead, unburned fuel, sulfur dioxide and huge amounts of carbon monoxide poured forth in abundance, polluting groundwater and atmosphere alike. To ensure that you select the right converter for your vehicle, the first step is to locate the vehicle emissions control information (VECI) tag, which can be found on or near the underside of the hood, the suspension tower or the radiator shroud. The tag may be missing due to exposure to the elements or accident damage.Compare the flow to a similar car if possible. 3. High or low fuel consumption. Better or worse gas mileage is one of the symptoms of a poor catalytic converter. While better gas mileage may sound like a good deal, it can damage your engine and may cause even more expensive repairs.Mar 3, 2021 · The value of the part. Catalytic converters are made of three different metals that hold a pretty steep price tag. Two of the metals, palladium and rhodium, are worth more per ounce than the price ... Feb 14, 2023 · Catalytic Converters Clean The Air An engine is an inherently unclean machine. It mixes fuel and air, compresses it, ignites it, and uses the explosion from that ignition thousands of times per... According to data from 2020, the most expensive catalytic converter belonged to the Ferrari F430, with a mind-popping $3,770.00 price tag. Moreover, the F430 needed two of them, so a full replacement would run car owners $7,540 before labor costs. While the Lamborghini Aventador’s converter is technically the third most expensive, at $3,120 ...Aug 13, 2020 · Two-way catalytic converters do a poor job of reducing NOx (nitrogen oxides), which led to the development of three-way plus air converters. In addition to the two oxidation catalysts, they add a third chemical process: a reduction catalyst that converts NOx into N2 (nitrogen) and O2 (oxygen). Most vehicles built since the early 1980s use three ... Jan 20, 2020 · When to replace it. There are several signs that your catalytic converter is failing. The most obvious is a strong smell of rotten eggs. One engine emission is hydrogen sulfide, which normally gets converted into sulfur dioxide. However, if the catalysts fail, the hydrogen sulfide builds up and creates the stink. However, when it comes to catalytic converter thefts, thieves spare no one. The mechanics we spoke to said the most targeted cars for catalytic converter thefts are “regular” cars that common folk drive. Between January and May 2021, car thieves stole almost 26,000 catalytic converters in the United States. This equates to 5200 thefts a month!A catalytic converter typically has around 13 ounces of tungsten, making up about 90% of its weight and worth around 40$ on the market. The rest includes some copper, lead and nickel – all with lesser amounts exceeding two pounds each. Platinum accounts for about 0.03% of catalytic converter weight and is worth around 38 $ per gram.According to data from 2020, the most expensive catalytic converter belonged to the Ferrari F430, with a mind-popping $3,770.00 price tag. Moreover, the F430 needed two of them, so a full replacement would run car owners $7,540 before labor costs. While the Lamborghini Aventador’s converter is technically the third most expensive, at $3,120 ...The catalytic converter's construction is as follows: The catalyst support or substrate. For automotive catalytic converters, the core is usually a ceramic monolith that has... The washcoat. A washcoat is a carrier for the catalytic materials and is used to disperse the materials over a large... ...Oct 26, 2021 · For catalytic converters, the repair order showing when the repair involving the catalytic converter was removed and that vehicle’s identification number; For those not authorized to repair catalytic converters, a receipt from a person or company that repairs, overhauls, dismantles, or works on motor vehicles Apr 6, 2021 · The main purpose of a catalytic converter is to reduce harmful gases. It also helps optimize the vehicle's performance and efficiency. Yes, it is somewhat true that eliminating the cat will notably improve the performance of a car, as there is no scope for exhaust backpressure which is caused because of clogged cat- combs. 2. Clogging up of the catalytic converter. The photo on the left shows a clogged up catalytic converter from one of the cars we repaired. There are many reasons that can cause the catalytic converter to clog up, including bad gasoline, increased engine oil consumption, coolant leaks from the intake or a head gasket.Dec 14, 2022 · The metals in catalytic converters are catalysts. Catalysts are compounds that trigger a chemical reaction without being affected themselves. Catalytic converters have a honeycomb structure because it provides a lot of surface area for a lot of reactions. Catalytic converters use elements like Platinum (Pt), Palladium (Pd), and Rhodium (Rh) as ... The metals in catalytic converters are catalysts. Catalysts are compounds that trigger a chemical reaction without being affected themselves. Catalytic converters have a honeycomb structure because it provides a lot of surface area for a lot of reactions. Catalytic converters use elements like Platinum (Pt), Palladium (Pd), and Rhodium (Rh) as ...Jan 20, 2020 · When to replace it. There are several signs that your catalytic converter is failing. The most obvious is a strong smell of rotten eggs. One engine emission is hydrogen sulfide, which normally gets converted into sulfur dioxide. However, if the catalysts fail, the hydrogen sulfide builds up and creates the stink. The metals in catalytic converters are catalysts. Catalysts are compounds that trigger a chemical reaction without being affected themselves. Catalytic converters have a honeycomb structure because it provides a lot of surface area for a lot of reactions. Catalytic converters use elements like Platinum (Pt), Palladium (Pd), and Rhodium (Rh) as ...Dec 14, 2022 · The metals in catalytic converters are catalysts. Catalysts are compounds that trigger a chemical reaction without being affected themselves. Catalytic converters have a honeycomb structure because it provides a lot of surface area for a lot of reactions. Catalytic converters use elements like Platinum (Pt), Palladium (Pd), and Rhodium (Rh) as ... Dec 14, 2022 · The metals in catalytic converters are catalysts. Catalysts are compounds that trigger a chemical reaction without being affected themselves. Catalytic converters have a honeycomb structure because it provides a lot of surface area for a lot of reactions. Catalytic converters use elements like Platinum (Pt), Palladium (Pd), and Rhodium (Rh) as ... CARB Compliant Catalytic Converters. Shop By Vehicle. Filter - 201 Products. Sort By Featured. FILTERS. Clear Filters. Part Type. Catalytic Converter. Catalytic Converter with Integrated Exhaust Manifold. Mar 9, 2023 · Additionally, the height of the vehicle makes it easier for thieves to reach the catalytic converter. With less time needed to get the job done and a good payday ahead, these are some of the most targeted vehicles. Ford F-250 and Toyota Tacoma are two great examples of this. 3. Luxury Cars. A catalytic converter typically has around 13 ounces of tungsten, making up about 90% of its weight and worth around 40$ on the market. The rest includes some copper, lead and nickel – all with lesser amounts exceeding two pounds each. Platinum accounts for about 0.03% of catalytic converter weight and is worth around 38 $ per gram.Palladium has a price of $2,049 per ounce or $65 per gram. Platinum has a price of $977 per ounce or $31 per gram. On average, a catalytic converter contains 3-7 grams of platinum, 2-7 grams of palladium, and 1-2 grams of rhodium. Speaking purely in numbers, that’s at least $700 in precious metals alone, but there’s a catch.Compare the flow to a similar car if possible. 3. High or low fuel consumption. Better or worse gas mileage is one of the symptoms of a poor catalytic converter. While better gas mileage may sound like a good deal, it can damage your engine and may cause even more expensive repairs.3. Toyota Prius. Toyota. The Toyota Prius is especially attractive when it comes to catalytic converter theft. This is partly due to the fact its gasoline-electric hybrid powertrain’s internal ...2011-17. Chrysler 200. 2001-21. Toyota Prius. These are just the models that most commonly get their catalytic converters stolen. Your vehicle could also be at risk for catalytic converter theft based on a few other factors. Here’s an idea of which types of vehicles are even more at-risk for catalytic converter theft:Apr 19, 2023 · The NICB says a typical catalytic converter can fetch anywhere from “$50 to $250” apiece. That might not sound like much, but consider that a quick-working thief needs a few short minutes to ... Part of the scare and frustration of catalytic converters is the fact that prices for replacement vary wildly. The main difference in lies within direct-fit vs a universal fit unit. For many vehicles, a muffler shop can easily weld in a universal replacement converter for $2-300.00.Catalytic converters play an important role in reducing harmful emissions from vehicles. They work by utilizing chemical reactions to convert pollutants such as carbon monoxide and nitrogen oxide into less harmful substances like water and carbon dioxide. This process is facilitated through the use of metal catalysts that promote and accelerate chemical reactions. In addition, […]Sep 5, 2023 · Catalytic Converters. ( September 7th, 2023, 8:00 am ) Metal/Material. Current Price. National Catalytic Converter Average. Average price for catalytic converters in the US. VIEW METAL DETAILS. $82.02/each. Large Foreign Cat. What’s The Difference Between A CARB Compliant Catalytic Converter And A Regular Catalytic Converter? Catalytic converters of any description are good news for the environment. Gas powered vehicles emit a lot of greenhouse gasses that are dangerous for our environment, and the catalytic converters found in such vehicles work to reduce this ... Aug 8, 2023 · A catalytic converter is an emissions control device that helps remove harmful greenhouse gases from a vehicle’s exhaust. The catalytic converter (or "cat") is the second component in a vehicle’s exhaust system (behind the exhaust manifold). It’s followed by the mid-pipes, resonator, muffler, and tailpipe. Patented in 1950 by Eugene ... Mar 2, 2023 · Compare the flow to a similar car if possible. 3. High or low fuel consumption. Better or worse gas mileage is one of the symptoms of a poor catalytic converter. While better gas mileage may sound like a good deal, it can damage your engine and may cause even more expensive repairs. May 27, 2023 · Simply search by make, model, or serial number to get an estimate of its worth. Ecotrade Group has an app called Eco Cat that provides access to over 20,000 scrap catalytic converter codes with prices and pictures. You can use this tool to quickly look up the value of your converter and get a quote from a buyer. The average catalytic converter has 3 to 7 grams of platinum worth about $100 – $237. Platinum is more valuable than gold, silver, and even palladium and is a good target for thieves. As of 2022, the platinum price is $997 per ounce and $32.18 per gram. Keep in mind the platinum price constantly fluctuates. May 27, 2023 · Simply search by make, model, or serial number to get an estimate of its worth. Ecotrade Group has an app called Eco Cat that provides access to over 20,000 scrap catalytic converter codes with prices and pictures. You can use this tool to quickly look up the value of your converter and get a quote from a buyer. Feb 14, 2023 · Catalytic Converters Clean The Air An engine is an inherently unclean machine. It mixes fuel and air, compresses it, ignites it, and uses the explosion from that ignition thousands of times per... Catalytic converters play an important role in reducing harmful emissions from vehicles. They work by utilizing chemical reactions to convert pollutants such as carbon monoxide and nitrogen oxide into less harmful substances like water and carbon dioxide. This process is facilitated through the use of metal catalysts that promote and accelerate chemical reactions. In addition, […]Aug 4, 2023 · 2011-17. Chrysler 200. 2001-21. Toyota Prius. These are just the models that most commonly get their catalytic converters stolen. Your vehicle could also be at risk for catalytic converter theft based on a few other factors. Here’s an idea of which types of vehicles are even more at-risk for catalytic converter theft: Feb 21, 2023 · The catalytic converter is a component that most people aren’t familiar with. Although most buyers won’t consider a catalytic converter as a primary criterion when shopping, it’s, in fact, one of the most valuable parts of a car. Unfortunately, many of you were acquainted with catalytic converters because they’re popular targets for ... The catalytic converter's construction is as follows: The catalyst support or substrate. For automotive catalytic converters, the core is usually a ceramic monolith that has... The washcoat. A washcoat is a carrier for the catalytic materials and is used to disperse the materials over a large... ...A catalytic converter is responsible for transforming 98% of harmful emissions into less toxic emissions. Note, we say less poisonous and not harmless emissions.A new catalytic converter costs anywhere from $600 to $2,500. Keep in mind that some vehicles have more than one converter, which would increase the overall cost. If you’re looking to save some cash, you can consider purchasing a catalytic converter from a scrap yard. Prices on catalytic converters: Source. Price Range.Mar 3, 2021 · The value of the part. Catalytic converters are made of three different metals that hold a pretty steep price tag. Two of the metals, palladium and rhodium, are worth more per ounce than the price ... Catalytic converters are a vital component of a car’s exhaust or emissions system, reducing the pollutants entering the atmosphere. The metal catalyst neutralizes harmful gases like hydrocarbons, carbon monoxide, and nitrogen oxides, turning them into water vapor and carbon dioxide. Catalytic converters have been mandated in the U.S. since 1975.A ‘catalyst’ is a substance that accelerates a chemical reaction, and within a catalytic converter, there are two types of catalyst. The first is a reduction catalyst which uses platinum and ...What’s Inside a Catalytic Converter That Thieves Want? Catalytic converters contain the precious metals rhodium, palladium, and platinum. Together, these elements act as a catalyst—a chemical that starts a reaction without undergoing any change itself.So your car or truck is running well, but that "check engine" light is on, with a code P0420 or P0430, and related "catalyst efficiency below threshold" codes. You like your car, so you take it to be looked at. You choke on the estimate of $1400 or more to replace the converter on your car.Aug 13, 2016 · A catalytic converter makes no use if short distances are run, Like in my town. When he is hot, he cleans well. Problems with a catalytic converter can occur when exhaust-gas is rich in fuel becouse of faulty fuel injection, And/or sensors are broken, it can melt down, and clog exhaust system. However, when it comes to catalytic converter thefts, thieves spare no one. The mechanics we spoke to said the most targeted cars for catalytic converter thefts are “regular” cars that common folk drive. Between January and May 2021, car thieves stole almost 26,000 catalytic converters in the United States. This equates to 5200 thefts a month! Sep 3, 2022 · Catalytic converters, which are located underneath a vehicle and control exhaust emissions, are made with three types of valuable metals: platinum, rhodium and palladium. Step 1: Contact the Authorities. If you find your catalytic converter is missing, you should immediately contact the authorities. They will check local security cameras and work to see if they can help catch the person who stole your converter. Additionally, a police report may be essential to your insurance coverage. 4. Cut The Exhaust Pipes Off Your Scrap Car. When you are prepping your catalytic converter for the scrap yard we mentioned above, do not remove the honeycomb, but you also want to make sure you keep the shell of the catalytic converter on. However, on either end of it are the exhaust pipes. These can be removed and cut as close to the shell as ...A catalytic converter is a large metal box, bolted to the underside of your car, that has two pipes coming out of it. One of them (the converter's "input") is connected to the engine and brings in hot, polluted fumes from the engine's cylinders (where the fuel burns and produces power).A catalytic converter typically has around 13 ounces of tungsten, making up about 90% of its weight and worth around 40$ on the market. The rest includes some copper, lead and nickel – all with lesser amounts exceeding two pounds each. Platinum accounts for about 0.03% of catalytic converter weight and is worth around 38 $ per gram. A catalytic converter is an exhaust emission control device that converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction. Aug 13, 2016 · A catalytic converter makes no use if short distances are run, Like in my town. When he is hot, he cleans well. Problems with a catalytic converter can occur when exhaust-gas is rich in fuel becouse of faulty fuel injection, And/or sensors are broken, it can melt down, and clog exhaust system.
To ensure that you select the right converter for your vehicle, the first step is to locate the vehicle emissions control information (VECI) tag, which can be found on or near the underside of the hood, the suspension tower or the radiator shroud. The tag may be missing due to exposure to the elements or accident damage.. Skyrim hrodulf
A catalytic converter is part of your car’s exhaust system that converts harmful engine-exhaust pollutants into something less harmful to the environment through a chemical reaction.Palladium has a price of $2,049 per ounce or $65 per gram. Platinum has a price of $977 per ounce or $31 per gram. On average, a catalytic converter contains 3-7 grams of platinum, 2-7 grams of palladium, and 1-2 grams of rhodium. Speaking purely in numbers, that’s at least $700 in precious metals alone, but there’s a catch.Part of the scare and frustration of catalytic converters is the fact that prices for replacement vary wildly. The main difference in lies within direct-fit vs a universal fit unit. For many vehicles, a muffler shop can easily weld in a universal replacement converter for $2-300.00.The metals in catalytic converters are catalysts. Catalysts are compounds that trigger a chemical reaction without being affected themselves. Catalytic converters have a honeycomb structure because it provides a lot of surface area for a lot of reactions. Catalytic converters use elements like Platinum (Pt), Palladium (Pd), and Rhodium (Rh) as ...Mar 2, 2023 · Compare the flow to a similar car if possible. 3. High or low fuel consumption. Better or worse gas mileage is one of the symptoms of a poor catalytic converter. While better gas mileage may sound like a good deal, it can damage your engine and may cause even more expensive repairs. Catalytic converters reduce 87% of hydrocarbon emissions, 85% carbon monoxide & 62% nitrous oxide throughout the expected car life. The catalytic converter is an essential device in gas-fueled cars. If the car generates emissions, it requires this converter. It reduces harmful emissions from the cars. Catalytic converters reduce 87% of hydrocarbon emissions, 85% carbon monoxide & 62% nitrous oxide throughout the expected car life. The catalytic converter is an essential device in gas-fueled cars. If the car generates emissions, it requires this converter. It reduces harmful emissions from the cars. Feb 15, 2023 · That said, replacing a catalytic converter can cost anywhere between a few hundred dollars to well over two thousand. The average cost is typically between $900 and $2,500, depending on the situation. It’s best to visit multiple well-respected mechanics and get several estimates to find the best price in your area. A catalytic converter is an exhaust emission control device of your vehicle that is responsible for reducing the amount of pollutants and toxic gases from the exhaust gas. Exhaust gas is the result of the internal ignition of the engine of a vehicle. It contains a lot of pollutants and toxic gases that harm the environment after coming out ...A catalytic converter is a device that uses a catalyst to convert the three harmful compounds into harmless ones. The catalyst formulation comprises three key constituents: precious metals (platinum, palladium, rhodium), alumina, and rare-earth-based materials which enhance catalytic activity of the metals. What’s The Difference Between A CARB Compliant Catalytic Converter And A Regular Catalytic Converter? Catalytic converters of any description are good news for the environment. Gas powered vehicles emit a lot of greenhouse gasses that are dangerous for our environment, and the catalytic converters found in such vehicles work to reduce this ... Catalytic converters are a vital component of a car’s exhaust or emissions system, reducing the pollutants entering the atmosphere. The metal catalyst neutralizes harmful gases like hydrocarbons, carbon monoxide, and nitrogen oxides, turning them into water vapor and carbon dioxide. Catalytic converters have been mandated in the U.S. since 1975.Catalytic converters play an important role in reducing harmful emissions from vehicles. They work by utilizing chemical reactions to convert pollutants such as carbon monoxide and nitrogen oxide into less harmful substances like water and carbon dioxide. This process is facilitated through the use of metal catalysts that promote and accelerate chemical reactions. In addition, […]Just the words "catalytic converter theft" can make car owners shudder. It's a highly inconvenient issue that's on the rise due to the valuable metals within these critical emissions-control devices.2. Clogging up of the catalytic converter. The photo on the left shows a clogged up catalytic converter from one of the cars we repaired. There are many reasons that can cause the catalytic converter to clog up, including bad gasoline, increased engine oil consumption, coolant leaks from the intake or a head gasket.Aug 20, 2023 · A catalytic converter is a device used to reduce the emissions from an internal combustion engine (used in most modern day automobiles and vehicles). Not enough oxygen is available to oxidize the carbon fuel in these engines completely into carbon dioxide and water; thus toxic by-products are produced. Catalytic converters are used in exhaust ... Oct 6, 2022 · Catalytic converters first appeared in the mid-1970s and quickly started to be used universally. It is a part of your car’s exhaust system that converts harmful engine-exhaust pollutants into something less harmful to the environment through chemical reactions. Most hydrocarbons, carbon monoxide, and nitrogen oxides convert into the “less ... .