I understand that PM2.5 refers to fine particulate matter smaller than 2.5 microns, but I’m trying to figure out what that actually consists of in a home. What household materials, activities, or conditions typically cause elevated PM2.5 levels indoors? And what are PM2.5 sensors actually detecting — is it dust, smoke, chemicals, or something else?
There are some articles about it on airgradient’s site. You can start here.
Spoiler: it’s complicated.
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