Air Quality September 09, 2018, 05:36:29 pm Here's something that should be of interest for all the folks in Calif who are now or soon will be traveling the Golden State. https://www.airnow.gov/state/CA/index.cfm
Re: Air Quality Reply #1 – September 09, 2018, 07:00:52 pm The numbers are for combined particulate matter (PM) and ozone.The parent site at EPA's Air Now for more info.