Not much has changed since yesterday where the country was covered in clouds. By Saturday afternoon, haze covered the LA basin and several sites near the coast are showing Unhealthy for Sensitive Groups readings. The left panel below shows the overlay of AIRNOW AQI readings and the AQUA Modis RGB image. In the right panel, haze which is aggrevated by fog and low cloud covers the lower San Joaquin Valley. PM readings have not broken 35 µgr m-3 in the SJV. We are starting to pack for the DISCOVER-AQ experiment in the valley from January 16 to February 24.
The Long Beach California ABC News 7 webcam shows the haze which is driven by humidity.... smoke and fog = smog.
Update: December 9, 2012 16:00 EST
Clouds continue to cover most of the country (left below). The air quality in the LA basin has gotten worse and the haze over the basin is now sloshing off shore. Several areas in the basin are in the Unhealthy for Sensitive Groups range. The actual PM 2.5 readings overnight downtown were in excess of 80 µg m-3 range which is Unhealthy for everyone.