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Where Does California's Smog Come From?

Smog in California comes mostly from car emissions. Photochemical smog typically occurs in big urban areas with a large number of automobiles and a dry, sunny climate, according to PollutionIssues.com.

  1. Photochemical Smog

    • The combustion of fossil fuels produces hydrocarbons and nitrogen oxide that react with sunlight to produce a hazy mix consisting of ozone and other pollutants.

    Los Angeles

    • The first recorded notice of smog occurred in 1943, when outdoor visibility in Los Angeles plummeted and people began to suffer respiratory difficulties, nausea, vomiting and eye irritation. In 1947, the governor signed the Air Pollution Act to establish an Air Pollution Control District in every state county, according to PBS.org.

    Control

    • Control of photochemical smog consists of efforts to reduce automobile emissions. Control methods include the use of catalytic converters, regular vehicle emission checks and gasoline with lower volatility, according to Pollution Issues. California has passed measures to reduce smog and to improve overall air quality.

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