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Re:Ask HN: Any HNers have air quality sensors near-ish 'East... by adamredwoods on Tuesday February 14, 2023 @02:54AM (#34786665)
The EPA is releasing sampled air data here:

https://response.epa.gov/site/site_profile.aspx?site_id=1593...

You can request air sampling, they have contact information on that site.

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