particulate matter in the air https://www3.epa.gov/pmdesignations/faq.htm … can be measured. http://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20160808075431&SearchText=pm2.5 … #pdxcleanair
Replying to @donpdonp
i’m very curious about trying some of those inexpensive sensors. the one i have is too pricey.
9:11 AM - 8 Aug 2016
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