NOxstandardok

NOx standard, also referred to as NOx standardok, is a term used to describe specific regulations and standards for controlling nitrogen oxides emissions from various sources, including power plants, industrial processes, and vehicles.

The NOx standard was established by the United States Environmental Protection Agency (EPA) in 1998, as part of the Clean Air Act Amendments. The standard sets limits on the amount of nitrogen oxides that may be emitted from power plants, industrial processes, and other sources. The purpose of the standard is to reduce nitrogen oxides emissions, which contribute to the formation of ground-level ozone and smog, and are a key contributor to acid rain and air pollution.

There are two main NOx standards: the Phase 1 and Phase 2 standards. The Phase 1 standard applies to power plants with a capacity below 500 megawatts, and sets a limit of 1.2 pounds of nitrogen oxides per megawatt-hour (lb/mmBtu) for all coal-fired power plants. The Phase 2 standard applies to power plants with a capacity above 500 megawatts, and sets a more stringent limit of 0.15 lb/mmBtu.

Vehicles are also subject to NOx standards, which have been implemented to reduce emissions from diesel engines and passenger vehicles. The standards require manufacturers to certify their vehicles as meeting specific emission standards, and to implement technology to reduce NOx emissions.

The NOx standard has been effective in reducing nitrogen oxides emissions from various sources and has contributed to improved air quality and public health. However, it continues to evolve, with new standards and regulations being implemented to address emerging air quality concerns.