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If you live basically anywhere on the US west coast you have to deal with the annual wildfire smoke season. During smoke events the air quality measurement to worry about is amount of 2.5 micron particulate matter in the air. When the air quality rating is 100, that's about equivalent to smoking about 1.6 cigarettes per day. I've seen numbers as high as 600 during wildfire events in the PNW.


During those events to reduce your exposure you need to stay indoors, keep the windows closed, and filter the air as best you can. Thanks to the pandemic we've normalized mask wearing; make sure you've got your N95's ready if you have to go outside.


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