The news isn't any good in California when it comes to soot either: Fresno has the nation's highest levels of that form of air pollution, and six of the nation's 10 'sootiest' cities are again in California. Want news from USA TODAY on WhatsApp? Click this link on your mobile device to get started The report covers the two main types of air pollution that plague the USA: smog (also known as ground-level ozone) and soot (technically known as 'particulate matter'). Warmer temperatures make ozone more likely to form. Smog forms on warm, sunny days and is made worse by chemicals that exit vehicle tailpipes and power plant and industrial smokestacks. The bad news came from the American Lung Association's annual 'State of the Air' report, which covers the years 2015-2017. Los Angeles has had the worst smog for 19 years of the 20-year history of the report. LA isn't alone when it comes to smog-choked cities in California: seven of the nation's top 10 smoggiest cities are in the Golden State, including other sprawling cities such as San Francisco, San Diego and Sacramento. state with the worst air pollution continues as Los Angeles is again the nation's smoggiest metro area, according to a report released Wednesday.

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