What is the air quality trend in Williamsport?

Over the past 20 days, Williamsport had an average AQI of 40 based on station measurements. The worst day was 2026-07-16 with AQI 88.

How is Williamsport air quality measured?

Air quality in Williamsport 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 Williamsport, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

238h

PM2.5 Station

238h · 2 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	39	17–70	9.8 µg/m³	14h	1
2026-07-20	31	1–63	8.0 µg/m³	15h	1
2026-07-19	38	15–61	9.6 µg/m³	9h	1
2026-07-18	58	17–153	17.7 µg/m³	15h	1
2026-07-17	74	21–263	34.7 µg/m³	17h	1
2026-07-16	88	5–218	41.0 µg/m³	10h	1
2026-07-15	59	3–155	18.0 µg/m³	13h	1
2026-07-14	24	9–44	5.8 µg/m³	17h	1
2026-07-13	38	22–84	9.7 µg/m³	14h	1
2026-07-12	36	13–51	8.7 µg/m³	16h	1
2026-07-11	38	5–56	9.1 µg/m³	17h	1
2026-07-10	33	12–53	7.9 µg/m³	13h	1
2026-07-09	29	5–47	7.1 µg/m³	13h	1
2026-07-08	36	27–57	8.8 µg/m³	8h	1
2026-07-07	25	5–37	5.9 µg/m³	9h	1
2026-07-06	29	13–49	7.0 µg/m³	5h	1
2026-07-05	25	2–56	6.0 µg/m³	9h	1
2026-07-04	22	7–36	5.2 µg/m³	8h	1
2026-07-03	40	19–71	10.4 µg/m³	10h	1
2026-07-02	55	23–103	16.6 µg/m³	6h	1

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