{
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 "date": "2026-10-17",
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   "dtype": "String"
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   "dtype": "String"
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  {
   "name": "lat",
   "dtype": "Float64"
  },
  {
   "name": "lon",
   "dtype": "Float64"
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  {
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   "dtype": "Float64"
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 ],
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 "row_groups": "one per year",
 "span": {
  "start": "1957-01-01T00:00:00+00:00",
  "end": "2026-06-03T00:00:00+00:00"
 },
 "source_file": "location_storehouse/air_quality_site/_manifest.parquet",
 "url": "https://data.terrapulse.info/dex/air_quality_site/2026-10-17.parquet",
 "latest_url": "https://data.terrapulse.info/dex/air_quality_site/latest.parquet",
 "family": "locationdex",
 "storage": "dossier",
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 "sources": [
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 ],
 "licence_basis": "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).",
 "commercial_use": true,
 "cite": "TerraPulse (terrapulse.info) for the organizing; the sources above for the measurements, as their licence requires.",
 "same_as": "2026-10-16"
}