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The Clean Air Act of 1963 (CAA) was passed as an extension of the Air Pollution Control Act of 1955, encouraging the federal government via the United States Public Health Service under the then-Department of Health, Education, and Welfare (HEW) to encourage research and development towards reducing pollution and working with states to establish their own emission reduction programs.
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The American flag stands against the backdrop of a smoggy Los Angeles in 1972. The California Smog Check Program is an attempt to reduce smog in California. The California Smog Check Program requires vehicles that were manufactured in 1976 or later to participate in the biennial (every two years) smog check program in participating counties. [1]
The AQI can increase due to an increase of air emissions. For example, during rush hour traffic or when there is an upwind forest fire or from a lack of dilution of air pollutants. Stagnant air , often caused by an anticyclone , temperature inversion , or low wind speeds lets air pollution remain in a local area, leading to high concentrations ...
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In 2012, the Public Policy Institute of California (PPIC) Survey on Californians and the Environment showed that 45% of citizens in Los Angeles consider air pollution to be a "big problem", and 47% believe that the air quality of Los Angeles is worse than it was 10 years ago. [96] In 2024, the Los Angeles-Long Beach-Riverside area ranked the ...
Since 1997, smog-forming emissions have been reduced by around 70%, largely due to the adoption of cleaner car engines and, more recently, electric vehicles, according to the air district. At the ...
Vermont – annually; inspections are due at the end of even-numbered months only. Inspections performed in an odd-numbered month will receive a sticker for the next even-numbered month (e.g., a car inspected in November 2011 will receive a sticker good until December 31, 2012). Inspection stickers are placed on the lower left of windshield [18]