Air-quality monitoring sites

Every air-quality site in the TerraPulse dex: a count, a map and the first 50, measured, with the source and licence of every number.

12,282 air-quality sites.

The first in the file
whenname
UNIV MED & DENTAL BLDG 619 SO 19TH ST
POLICE & COURTS BLDG 700 W MARKHAM
UNKNOWN COORDINATE LOCATION
ON BUILDING
Anaheim (1010 Harbor Blvd)
172 W 3RD ST, SAN BERNARDINO
210 HIGHLAND, EL CAJON
LIBRARY-8TH & E ST, SAN DIEGO
San Francisco-Health Dept.
San Jose-Moorpark Ave.

Measured by epa_aqs_airdata_hourly, epa_castnet. EPA Air Quality System AirData files and EPA CASTNET station files - US federal work, public domain by statute (17 U.S.C. 105); EPA Standard Open Data License read 2026-10-07 at edg.epa.gov/EPA_Data_License.html: 'all data produced by the U.S EPA is by default in the public domain' (2026-10-07; CASTNET station registry added 2026-10-13 under the same statement). Lake of 2026-11-07.