January 23, 2010
The San Francisco Chronicle recently wrote about the new smog limits proposed by the EPA. Contra Costa County suffers from some of the poorest air quality in the Bay Area. The county has a ground-level ozone concentration of 78 parts per billion, which is higher than the 75ppb standard set in 2008, and markedly higher than the newly proposed standard of 60-70ppb. The Chronicle has an interesting map showing East Bay smog levels by county.