Bad Air Days in Cambria County, Pennsylvania: under 1 a Year

under 1 bad air day a year

Rare: among the cleanest-air counties EPA monitors. Ranked 788 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly particles: smoke and dust (67% particle days).

Which months to watch

Most bad days here fall in June and July. Averaged over 2016 to 2025.

What actually helps here

Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
On the odd bad day, check AirNow and keep windows shut.

Better or worse than it was

In 2000 to 2009 this county averaged 13 bad days a year; in 2016 to 2025, under 1. The air has improved. The worst recent year was 2023, with 3 bad days on 363 monitored days.

Date	AQI	Main pollutant
2023-06-29	201	PM2.5
2023-06-28	175	PM2.5
2023-06-30	154	PM2.5
2021-07-20	130	PM2.5
2022-06-22	119	Ozone

An ordinary day in Cambria

Across 3,633 monitored days from 2016 to 2025, the air in Cambria County rated Good on 58% of them, less often than the 72% typical of monitored counties, and Moderate on 42%. The median day sat at AQI 47; one day in ten went above 63.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)67%2,432 days
ozone32%1,171 days

Cambria County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	365	272	92	1	0	41	115
2024	365	269	96	0	0	42	87
2023	363	213	147	3	3	46	201
2022	363	171	191	1	0	52	119
2021	353	169	183	1	0	51	130
2020	366	228	138	0	0	44	90
2019	365	229	136	0	0	45	89
2018	363	230	133	0	0	44	93
2017	364	121	243	0	0	55	92
2016	366	211	155	0	0	46	97
2015	365	130	235	0	0	54	97
2014	365	151	212	2	0	53	108
2013	365	134	228	3	0	54	129
2012	366	145	214	7	1	54	159
2011	361	128	227	6	0	56	122
2010	365	104	251	10	0	58	150

*2025 may be a partial year in EPA's file.

Pennsylvania compared

How this is counted

A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.