Residents of Stanislaus County are still subjected to breathing in some of the worst air in the country, according to the American Lung Association’s State of the Air report. The State of the Air report for 2016 gave Stanislaus County "F" grades for having high ozone days and particle pollution levels in a 24-hour period, and failed when it came to the annual level of particle pollution. Particle pollution is particulate matter like soot, ash, dust and other miniscule materials that can be breathed in.