July 13, 2017

Low PM 2.5 in the nation

Air quality was mostly good today, with some Code Yellow (Moderate) levels of PM 2.5 seen in the Mid-Atlantic and the Pacific Southwest (AirNow, top left). The rest of the nation more or less had low levels of PM 2.5. The elevated PM 2.5 seen in the Pacific Southwest was most likely due to smoke seen in this area, as seen in NOAA's HMS map, top right. Ozone, however, was not as good today. There was a lot of Code Yellow and Code Orange(Unsafe for Sensitive Groups) in the Pacific Southwest and Northwest, and the Rocky Mountain States, along with some Code Red(Unsafe) in the Pacific Southwest (AirNow, bottom left). This ozone was most likely due to high pressure systems in these areas, as seen in NOAA's pressure map, bottom right. In Baltimore, particle pollution was observed in the early hours, as shown in the lidar timeseries. The particles were confined from 3-5.5 km in the early hours of observations. The boundary layer extended to max heights of 2 km.

Posted by mglover at July 13, 2017 9:42 PM
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