SANTA BARBARA COUNTY, Calif. - Santa Barbara, San Luis Obispo and Ventura Counties received failing grades from the American Lung Association for ozone.
The "F" grades are published in its 2017 "State of the Air" report.
San Luis Obispo also got a "D" grade for particle pollution, while Santa Barbara and Ventura Counties received A's.
Ozone is basically smog and particle pollution is soot.
All of it is harmful to the air people breath and can be deadly for people with asthma, lung cancer, and other health issues.
The latest ozone and particle pollution statistics are not yet up to date, they are based the three years between 2013-2015.
Air Pollution Control District Director Aeron Arlin Genet said 2014 was the area's worst year and that 2014 could drag down next year's report. After that grades should improve.
Wildfires, drought, heat waves often lead to a spike in ozone,
But there is a promising trend, the number of unhealthy air quality days per year are dropping.
American Lung Association staff members have shared concerns about Environmental Protection Agency cuts that will reduce enforcement of the Clean Air Act.
Genet said people can do their part to help by walking, riding or taking the bus. She also recommends replacing old cars with new ones that don't just rely on gasoline.
Residents can check their zip codes for air quality grades by logging onto www.stateoftheair.org.