Date: 11/15/18 5:33 pm
From: William Grant <wbgrant...>
Subject: [SFBirds] Air pollution map for SF
Just found this URL showing PM2.5 pollution (particles less than 2.5 microns), the most dangerous particulate matter since they are most likely to lodge in the lungs.

Birders who do venture out in these conditions may want to wear masks.


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