November 23, 2017

Ozone levels continue to drop and low levels of PM 2.5

Air quality was mostly good today, with mostly Code Yellow (Moderate) levels being seen in the Mississippi Valley and the Great Lakes region, along with the Rocky Mountain States and California (AirNow, top left). However, this elevated PM 2.5 was not due to any smoke, as there was little to no smoke seen in the nation, as seen in NOAA's HMS map, top right. There were also very low levels of ozone seen in the nation, as seen in's ozone map, bottom left. This low amount of ozone is not surprising, as ozone levels generally decrease as the weather changes to colder temperatures. The cold temperatures could be seen in's temperature map, bottom right, which show that the areas with lower temperatures generally had higher levels of ozone.

Posted by mglover at November 23, 2017 9:26 PM
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