Home › United States › Norristown › History

Air Quality History for Norristown, United States

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

25
Current AQI
Good
48 Hours 7 Days 14 Days 20 Days

PM2.5 Trend

342h · 1 station

Daily Summary

Date AQI Range PM2.5 avg PM10 avg Hours Stations
2026-04-12 24 17–29 5.7 µg/m³ 3.7 3h 58
2026-04-11 27 17–41 6.5 µg/m³ 6.1 24h 85
2026-04-10 38 26–54 9.3 µg/m³ 9.4 24h 86
2026-04-09 36 31–42 8.6 µg/m³ 10.7 17h 81
2026-04-08 25 16–27 5.9 µg/m³ 3.8 9h 77
2026-04-07 31 23–40 7.5 µg/m³ 5.7 24h 86
2026-04-06 26 17–36 6.2 µg/m³ 4.5 18h 86
2026-04-04 46 38–64 11.5 µg/m³ 13.9 15h 80
2026-04-03 29 11–54 7.0 µg/m³ 8.3 24h 86
2026-04-02 17 11–51 4.2 µg/m³ 2.9 24h 75
2026-04-01 36 22–58 8.7 µg/m³ 9.3 23h 79
2026-03-31 32 25–41 7.8 µg/m³ 8.2 23h 79
2026-03-30 29 19–34 7.1 µg/m³ 7.1 11h 78
2026-03-29 38 30–51 9.1 µg/m³ 8.5 24h 82
2026-03-28 27 10–38 6.4 µg/m³ 4.7 24h 79
2026-03-27 40 18–70 11.0 µg/m³ 14.9 24h 86
2026-03-26 39 20–65 10.2 µg/m³ 13.0 24h 86
2026-03-25 38 35–43 9.2 µg/m³ 6.7 7h 86
Back to Norristown Air Quality