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Air Quality History for Chelmsford, United States

Historical PM2.5 and AQI trend from monitoring stations near Chelmsford, United States.

36
Current AQI
Good Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

462h

PM2.5 Station

462h · 2 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg PM10 avg Hours Stations
2026-07-22 25 25–25 6.1 µg/m³ 5.0 1h 2
2026-07-21 46 28–68 11.3 µg/m³ 13.1 24h 10
2026-07-20 56 28–166 16.2 µg/m³ 5.8 24h 11
2026-07-19 55 33–83 14.6 µg/m³ 21.6 24h 12
2026-07-18 70 28–99 21.8 µg/m³ 46.7 24h 12
2026-07-17 115 38–192 51.0 µg/m³ 4.1 24h 12
2026-07-16 86 40–173 30.1 µg/m³ — 24h 11
2026-07-15 55 30–103 14.6 µg/m³ 26.6 24h 12
2026-07-14 44 37–53 10.7 µg/m³ 16.8 24h 12
2026-07-13 36 24–51 8.7 µg/m³ 14.2 24h 12
2026-07-12 37 25–47 8.9 µg/m³ 11.4 24h 12
2026-07-11 40 32–48 9.5 µg/m³ 15.9 24h 12
2026-07-10 38 28–70 9.3 µg/m³ 5.0 24h 11
2026-07-09 34 24–40 8.1 µg/m³ — 24h 11
2026-07-08 34 26–48 8.2 µg/m³ 11.6 24h 12
2026-07-07 34 27–49 8.1 µg/m³ 12.7 24h 13
2026-07-06 34 13–48 8.1 µg/m³ 16.7 15h 10
2026-07-05 53 39–71 13.9 µg/m³ 24.9 24h 12
2026-07-04 42 27–59 10.1 µg/m³ 19.9 24h 12
2026-07-03 45 35–63 11.1 µg/m³ 14.7 24h 12
2026-07-02 45 10–89 11.8 µg/m³ 12.7 14h 10
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