Generally, air quality is good across the country. Even California has low particulates today. It only took a soaking rainstorm to do it. In the northeast, levels of PM2.5 approaching the Unhealthy for Sensitive Groups levels are seen in New York,, but they are under cloud cover so we don't get a good view of the haze (left).
For those who don't recall, GOES-13 had an upset condition in September and was turned off. For several weeks, GOES-15 filled in for GOES-13 (EAST) but it was in the wrong position for the GASP algorithm to work (angles between the sun and sensor were incorrect for the GASP algorithm). GOES-13 was turned back on in early October and this week, enough surface data has been collected for the algorithm to begin giving AOD results. On the right below, you can see the GASP-EAST loop. The AOD looks high and there may be a few weeks before the minimum surface reflectance is correct.
That air clearing weather in California is shown below left from weather.gov. Floods are expected across northern California and a winter weather advisory is posted for the Sierras. For those of you going to AGU, don't forget to pack a raincoat or umbrella. It could be worse, you could be going to Seattle.