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  2. NOx - Wikipedia

    en.wikipedia.org/wiki/NOx

    The use of exhaust gas recirculation and catalytic converters in motor vehicle engines have significantly reduced vehicular emissions. NO x was the main focus of the Volkswagen emissions violations. Other technologies such as flameless oxidation and staged combustion significantly reduce thermal NO x in industrial processes.

  3. Regional Clean Air Incentives Market - Wikipedia

    en.wikipedia.org/wiki/Regional_Clean_Air...

    The emission rights in RECLAIM are called RECLAIM Trading Credits (RTC), with one RTC for each tonne of NOx or SOx emissions. During 2005, NOx RTC average prices ranged from a low of $1,200 per ton for the Compliance Year 2004 RTCs, to $9,730 per ton for Compliance Year 2008 NOx RTCs, to $10,193 per ton of NOx RTCs for Compliance Years 2010 ...

  4. AIR Index - Wikipedia

    en.wikipedia.org/wiki/AIR_Index

    AIR Index is a British standardised motor vehicle emissions ranking system introduced in February 2019 by Allow Independent Road-testing (AIR). The objective of the system is to encourage the use of independent and meaningful motor vehicle NOx emissions tests to robustly inform consumers and policymakers of the real-world impact motor vehicles will have on urban air quality.

  5. Volkswagen emissions scandal - Wikipedia

    en.wikipedia.org/wiki/Volkswagen_emissions_scandal

    The Volkswagen emissions scandal, sometimes known as Dieselgate [24] [25] or Emissionsgate, [26] [25] began in September 2015, when the United States Environmental Protection Agency (EPA) issued a notice of violation of the Clean Air Act to German automaker Volkswagen Group. [27]

  6. Selective catalytic reduction - Wikipedia

    en.wikipedia.org/wiki/Selective_catalytic_reduction

    SCR systems are now the preferred method for meeting Tier 4 Final and EURO 6 diesel emissions standards for heavy trucks, cars and light commercial vehicles. As a result, emissions of NOx, particulates, and hydrocarbons have been lowered by as much as 95% when compared with pre-emissions engines. [2]

  7. Useful conversions and formulas for air dispersion modeling

    en.wikipedia.org/wiki/Useful_conversions_and...

    Many environmental protection agencies have issued regulations that limit the concentration of pollutants in gaseous emissions and define the reference conditions applicable to those concentration limits. For example, such a regulation might limit the concentration of NOx to 55 ppmv in a dry combustion exhaust gas corrected to 3 volume percent O 2.

  8. Emissions & Generation Resource Integrated Database

    en.wikipedia.org/wiki/Emissions_&_Generation...

    The Emissions & Generation Resource Integrated Database (eGRID) is a comprehensive source of data on the environmental characteristics of almost all electric power generated in the United States. eGRID is issued by the U.S. Environmental Protection Agency (EPA).

  9. Exhaust gas - Wikipedia

    en.wikipedia.org/wiki/Exhaust_gas

    When oxides of nitrogen (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, ground level ozone is formed, a primary ingredient in smog. A 2005 U.S. EPA report gives road vehicles as the second largest source of VOCs in the U.S. at 26% and 19% are from non road equipment which is mostly gasoline and diesel stations.