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  2. Vehicle emissions control - Wikipedia

    en.wikipedia.org/wiki/Vehicle_emissions_control

    Vehicle emissions control is the study of reducing the emissions produced by motor vehicles, especially internal combustion engines.The primary emissions studied include hydrocarbons, volatile organic compounds, carbon monoxide, carbon dioxide, nitrogen oxides, particulate matter, and sulfur oxides.

  3. Fog machine - Wikipedia

    en.wikipedia.org/wiki/Fog_machine

    A fog machine, fog generator, or smoke machine is a device that emits a dense vapor that appears similar to fog or smoke. This artificial fog is most commonly used in professional entertainment applications, but smaller, more affordable fog machines are becoming common for personal use. Fog machines can also be found in use in a variety of ...

  4. United States vehicle emission standards - Wikipedia

    en.wikipedia.org/wiki/United_States_vehicle...

    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.

  5. California Smog Check Program - Wikipedia

    en.wikipedia.org/wiki/California_Smog_Check_Program

    On hot, sunny days, pollutants from vehicles, industry, and many products may chemically react with each other. In the winter, temperature inversions can trap tiny particles of smoke and exhaust from vehicles and anything else that burns fuel. This keeps pollution closer to the ground.

  6. Smoking bans in private vehicles - Wikipedia

    en.wikipedia.org/wiki/Smoking_bans_in_private...

    Mainstream smoke is the smoke exhaled by a smoker. Sidestream smoke is smoke from the lighted end of a cigarette, pipe, or cigar, or tobacco burning in a hookah. This type of smoke has higher concentrations of cancer-causing agents (carcinogens) and is more toxic than mainstream smoke. It also has smaller particles than mainstream smoke.

  7. List of smoking bans in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_smoking_bans_in...

    Statewide smoking ban: On May 1, 2007, the Smoke Free Arizona Act (Proposition 201) went into effect after passage by 54.7% of voters the prior November, banning smoking in all enclosed workplaces and within 20 feet (6.1 m) of an entrance or exit of such a place, including bars and restaurants, only exempting private residences, retail tobacco ...