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Air Quality History for St. Catharines, Canada

Historical PM2.5 and AQI trend from monitoring stations near St. Catharines, Canada.

24
Current AQI
Good Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

170h

PM2.5 Station

170h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg Hours Stations
2026-07-21 32 30–34 7.7 µg/m³ 2h 1
2026-07-20 44 25–82 12.0 µg/m³ 6h 1
2026-07-19 70 28–149 22.8 µg/m³ 4h 1
2026-07-18 114 34–187 54.4 µg/m³ 4h 1
2026-07-17 175 162–188 102.0 µg/m³ 2h 1
2026-07-14 54 53–55 13.7 µg/m³ 3h 1
2026-07-13 57 48–61 14.9 µg/m³ 8h 1
2026-07-12 64 55–76 18.3 µg/m³ 7h 1
2026-07-11 36 8–61 8.9 µg/m³ 13h 1
2026-07-10 28 13–46 6.7 µg/m³ 14h 1
2026-07-09 35 25–43 8.4 µg/m³ 13h 1
2026-07-08 21 13–35 5.1 µg/m³ 11h 1
2026-07-07 25 13–34 6.0 µg/m³ 6h 1
2026-07-06 34 21–42 8.1 µg/m³ 6h 1
2026-07-05 45 25–72 11.9 µg/m³ 18h 1
2026-07-04 32 21–44 7.6 µg/m³ 22h 1
2026-07-03 39 29–50 9.4 µg/m³ 24h 1
2026-07-02 56 50–63 14.5 µg/m³ 7h 1
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