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In atmospheric chemistry, NO x is shorthand for nitric oxide (NO) and nitrogen dioxide (NO 2), the nitrogen oxides that are most relevant for air pollution. [1] [2] These gases contribute to the formation of smog and acid rain, as well as affecting tropospheric ozone.
The California Air Pollution Control District Act of 1947 allowed 1 or more counties to form air pollution districts. [5] [6] The California Bay Area Pollution Control Act of 1955 created the Bay Area Air Pollution Control District. [5] [7] The California Mulford-Carrell Air Resources Act of 1967 resulted in the creation of 11 air basins. [5] [8]
Nitrogen dioxide (NO 2) Primary and Secondary 0.053 ppm (100 μg/m 3) annual Annual mean 40 CFR 50.11: Primary 0.100 ppm (188 μg/m 3) 1-hour 98th percentile of 1-hour daily maximum, averaged over 3 years 40 CFR 50.11: Lead (Pb) Primary and Secondary 0.15 μg/m 3: Rolling 3 months Not to be exceeded 40 CFR 50.12
The South Coast AQMD includes all of Orange County; and the non-desert regions of Los Angeles County, San Bernardino County, and Riverside County including the Coachella Valley. The South Coast Air Basin area encompassed by the South Coast AQMD amounts to about 10,750 square miles (27,850 square kilometres) and is the second most populated area ...
San Diego is a city in Duval and Jim Wells counties, Texas, United States. The population was 3,748 at the 2020 census and 4,488 at the 2010 census . [ 4 ] It is located primarily in Duval County, of which it is the county seat .
One of several nitrogen oxides, nitrogen dioxide is a reddish-brown gas. It is a paramagnetic , bent molecule with C 2v point group symmetry . Industrially, NO 2 is an intermediate in the synthesis of nitric acid , millions of tons of which are produced each year, primarily for the production of fertilizers .
Nitrogen dioxide poisoning is the illness resulting from the toxic effect of nitrogen dioxide (NO 2). It usually occurs after the inhalation of the gas beyond the threshold limit value. [1] Nitrogen dioxide is reddish-brown with a very harsh smell at high concentrations, at lower concentrations it is colorless but may still have a harsh odour.
Population growth increases air pollution, as more vehicles are on the road. California's large population significantly contributes to the high amount of smog and air pollution in the state. [citation needed] In 1930, California's population was less than six million people and the total registered vehicles were two million. [16]