Air Quality Advisory Issued
By 250 News
Wednesday, January 06, 2010 11:31 AM
Haze hangs over Prince George prompting Air Quality Advisory
Prince George, B.C.- An Air Quality Advisory has been issued for Prince George.
The provincial air quality objective for fine particles, PM2.5, is 25 micrograms per cubic metre, averaged over 24 hours. The 24 hour PM2.5 rolling average was 27 µg/m3 at the Plaza 400 downtown site at 08:00 am and 27 µg/m3 at College Heights.
The provincial air quality objective for fine particles, PM10, is 50 micrograms per cubic metre, averaged over 24 hours. The 24 hour PM10 rolling average was 40 µg/m3 at the Plaza 400 downtown, 37 µg/m3 at BCR and 33µg/m3 at College Heights.
Based on the air quality data, the high levels are mainly due combustion emissions, including wood smoke (wood stoves) as well as emissions from industry and transportation sources such as automobiles, trucks and rail traffic.
An upper high pressure ridge has brought stagnant conditions over the region resulting in pollutants accumulating in the air shed. This ridge will slowly move eastward in the next 24-hours.
This episode is expected to continue at least until tomorrow morning.
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Posted by: MrPG on January 6 2010 1:04 PM
Two nights ago there was a nice clear sky at night with the moon shining as clear as can be. The morning following that also started off clear with no air movement to speak of.
By yesterday it started to get hazy and the moon was no longer clearly visible.
Today we have an air advisory. Very predictable. Follows the pattern as always.