I am unsure about the accuracy of the transparency numbers. Right now, this site say Milligan, CA has worse than usual transparency (0.3 mag/airmass), but the water vapor map, air quality index, and aerosol/smoke map all say transparency is quite good (links below).https://weather.gc.ca/astro/transparence_animation_e.html?utc=0https://airnow.gov/index.cfm?action=airnow.local_city&zipcode=92277&submit=Gohttp://www.ssd.noaa.gov/PS/FIRE/GASP/wloop.html