What is the air quality trend in Norristown?

Over the past 14 days, Norristown had an average AQI of 31 based on station measurements. The worst day was with AQI .

How is Norristown air quality measured?

Air quality in Norristown is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Norristown, United States

Name: Norristown Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

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

Current AQI
Good

48 Hours 7 Days 14 Days 20 Days

PM2.5 Trend

261h · 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	9.2 µg/m³	8.6	22h	78

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