Hold your breath for some bad news if youre a local.
Four are located in Southern and Central California, with Los Angeles leading.
The others, in order, are Visalia, California, Bakersfield, California, and Fresno-Madera-Hanford, California.
View of downtown Los AngelesAllen J. Schaben / Los Angeles Times via Getty Images
The outlier is the Phoenix-Mesa metro area in Arizona.
Despite Southern Californias ranking, the report shows ozone levels at about half of what they were historically.
