California Air Resources Board

Sources of air pollution such as automobiles, motorcycles, trucks, off-road vehicles, boats and airplanes. (See also stationary sources.) For more information, please go to our mobile sources portal page.

The periodic or continuous sampling and analysis of air pollutants in ambient air or from individual pollution sources.

Rate of disease incidence.

Death rate.

See AB 2766.

Exposure to a toxic substance from multiple pathways such as air, water, soil, food and breast milk.

The ability of a chemical or physical agent to produce heritable changes in the DNA of living cells.

Standards established by the U.S. EPA that apply for outdoor air throughout the country. There are two types of NAAQS. Primary standards set limits to protect public health and secondary standards set limits to protect public welfare. For more information, visit our AAQS website.

Non-manmade emission sources, including biological and geological sources, wildfires and windblown dust.

Naturally occurring asbestos (NOA) is the six asbestos minerals that have been identified as toxic air contaminants and occur naturally in rocks and soils. During many earth-disturbing activities, asbestos minerals may be released from rocks and soils, become airborne and inhaled deep into the lung.

The National Emissions Standards for Hazardous Air Pollutants (NESHAPs) are set by the U.S. EPA for an air pollutant not covered by National Ambient Air Quality Standards that may cause an increase in fatalities or in serious, irreversible, or incapacitating illness

Part of the comprehensive statewide solar program. The NSHP program provides financial incentives and other support to home builders, encouraging the construction of new, energy efficient solar homes that save homeowners money on their electric bills and protect the environment.

Uniform national U.S. EPA air emission standards that limit the amount of pollution allowed from new sources or from modified existing sources. For more information, see our Title V website.

A Clean Air Act requirement that State Implementation Plans must include a permit review, which applies to the construction and operation of new and modified stationary sources in nonattainment areas, to ensure attainment of National Ambient Air Quality Standards. The two major requirements of NSR are Best Available Control Technology and Emission Offsets. For more information, see our New Source Review website.

Any vehicle transferred with less than 7,500 miles, or any vehicle that has not yet been issued a title (regardless of mileage).

The National Institute of Standards and Technology (NIST) provides standard reference materials used to confirm the accuracy and traceability of standards for calibrating instrumentation used to measure atmospheric concentrations of air pollutants.

A Precursor of ozone, NO₂ and nitrate; nitric oxide is usually emitted from combustion processes. Nitric oxide is converted to nitrogen dioxide (NO₂) in the atmosphere and then becomes involved in the photochemical processes and/or particulate formation. (See Nitrogen Oxides.)