Re: Air Pollution Hit 350 Today Home›Forums›General Discussion›Air Pollution Hit 350 Today›Re: Air Pollution Hit 350 Today March 11, 2013 at 4:18 am #27963 BrianParticipant Checked my math, it looks like we had about 1ppm PM2.5+PM10 last night, or about 1mg of dirt for every cubic meter of air.
