This posting is from Sunny(!) California where I am out at the American Geophysical Union Fall Meeting in San Francisco. It is cold for SF (in the 30's, with frost in the morning) but it is not like home in Baltimore where there is now snow on the ground and the risk of freezing rain over the next 24 hours. Drive carefully in the east.
The MODIS image from this morning shows that the system that started in the Rockies by dumping on Denver has left a veil of snow all across the US. There are only a few places in the country that you can see the unsnowcovered surface. California and Washington are two of them. The AQI map for the country shows that PM is elevated to the unhealthy for sensitive groups range in Oregon and the very northern part of California. Generally, woodsmoke is a contributor to those elevated PM readings. For much of the rest of the US, the AQI is good.
In other AQI news, a new paper has been published in Lancet which says that the AQ standards in Europe are too lax. I have not yet read the paper which is featured in Monday's Independent newspaper.Posted by Ray Hoff at December 8, 2013 8:57 PM