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  2. United States vehicle emission standards - Wikipedia

    en.wikipedia.org/wiki/United_States_vehicle...

    The Tier I standard was adopted in 1991 and was phased in from 1994 to 1997. Tier II standards were phased in from 2004 to 2009. Within the Tier II ranking, there is a subranking ranging from BIN 1–10, with 1 being the cleanest (Zero Emission vehicle) and 10 being the dirtiest.

  3. Continuous emissions monitoring system - Wikipedia

    en.wikipedia.org/wiki/Continuous_emissions...

    2 pollutant concentration monitor and a volumetric flow monitor. For NO x, both a NO x pollutant concentration monitor and a diluent gas monitor are used to determine the emissions rate in weight per volume or weight per heat value (for example lbs/million Btu, lbs/ft 3, kg/kWh or kg/m 3). Opacity measurements are sometimes required, depending ...

  4. Emission standard - Wikipedia

    en.wikipedia.org/wiki/Emission_standard

    Emission standards are the legal requirements governing air pollutants released into the atmosphere. Emission standards set quantitative limits on the permissible amount of specific air pollutants that may be released from specific sources over specific timeframes. They are generally designed to achieve air quality standards and to protect ...

  5. U.S. engine maker facing largest Clean Air Act penalty ever ...

    www.aol.com/news/u-engine-maker-facing-largest...

    Engine manufacturer Cummins Inc. has agreed to pay a $1.675 billion penalty for allegedly installing "defeat devices" on approximately 1 million pickup trucks to cheat emissions tests.

  6. Non-road engine - Wikipedia

    en.wikipedia.org/wiki/Non-road_engine

    Japan introduced its own standards that are similar but not harmonized to the US Tier 3 and Europe Stage III A. Brazil adopted the resolution in 2011 to set emission standards that are equivalent to US Tier 3 and European Stage III A. [4] In Australia, the definition includes some stationary engines such as electric generators and pumps. [6]

  7. Worldwide Harmonised Light Vehicles Test Procedure - Wikipedia

    en.wikipedia.org/wiki/Worldwide_Harmonised_Light...

    To measure emissions during the on-road test, vehicles are equipped with a portable emissions measurement system (PEMS) that monitors pollutants and CO 2 values in real time. The PEMS contains complex instrumentation that includes: advanced gas analyzers, exhaust gas flowmeters , an integrated weather station , a Global Positioning System (GPS ...

  8. Not-To-Exceed - Wikipedia

    en.wikipedia.org/wiki/Not-To-Exceed

    The NTE cap is set at 1.25 times the FTP emission limit as described in the subsection above. For 2005 model year heavy-duty engines, the NTE emission cap for NMHC plus NOx is 1.25 times 2.5 grams per brake horsepower-hour, or 3.125 grams per brake horsepower-hour. The basic NTE control area for diesel engines has three basic boundaries on the ...

  9. Category:EPA Tier 3-compliant locomotives of the United ...

    en.wikipedia.org/wiki/Category:EPA_Tier_3...

    The following is a list of diesel-electric locomotives that meet or exceed EPA Tier 3 locomotive emissions regulations. Subcategories This category has only the following subcategory.