Cumberland County, Pennsylvania air quality history
Daily Air Quality Index summaries from EPA monitors in Cumberland, Pennsylvania, 2000–2025.
72%
Good days in 2025
35
Median daily AQI, 2025
0
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Cumberland, Pennsylvania on 365 days. 261 of those days (72%) were in the Good range, and the median daily AQI was 35. That median is lower than the typical monitored county in Pennsylvania (median 40 across 38 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 365 days. Across the years with fuller monitoring, the share of Good days rose: an average of 32% in 2000–2002 versus 67% in 2023–2025.
How the days broke down each year
Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.
Good
Moderate
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
Hazardous
Typical and high-end AQI over time
The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.
Median daily AQI
90th-percentile daily AQI
Main pollutant by day, 2025
On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.
Pollutant
Days as main pollutant
Share of monitored days
Fine particles (PM2.5)
365
100%
Year-by-year data
Annual AQI summary by year
Year
Days with AQI
Good
Moderate
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
Hazardous
Median AQI
90th pct.
Max AQI
Main pollutant
2025
365
261
104
0
0
0
0
35
62
96
PM2.5
2024
358
260
98
0
0
0
0
36
58
93
PM2.5
2023
365
212
146
3
2
2
0
44
68
224
PM2.5
2022
360
213
146
1
0
0
0
44
61
113
PM2.5
2021
365
209
155
1
0
0
0
47
63
114
PM2.5
2020
363
236
125
2
0
0
0
44
61
137
PM2.5
2019
365
178
182
5
0
0
0
51
68
150
PM2.5
2018
365
187
178
0
0
0
0
48
65
97
PM2.5
2017
359
220
138
1
0
0
0
43
61
103
PM2.5
2016
365
175
189
1
0
0
0
51
65
116
PM2.5
2015
363
133
229
1
0
0
0
54
73
121
PM2.5
2014
364
141
221
2
0
0
0
54
70
128
PM2.5
2013
364
141
214
9
0
0
0
54
70
135
PM2.5
2012
365
138
224
3
0
0
0
54
77
114
PM2.5
2011
362
114
244
4
0
0
0
58
80
144
PM2.5
2010
365
99
259
7
0
0
0
59
83
137
PM2.5
2009
365
102
257
6
0
0
0
57
77
117
PM2.5
2008
355
137
214
4
0
0
0
55
79
127
PM2.5
2007
329
120
203
6
0
0
0
56
83
121
PM2.5
2006
335
134
198
3
0
0
0
54
81
145
PM2.5
2005
345
117
214
14
0
0
0
59
85
120
PM2.5
2004
343
104
228
11
0
0
0
58
85
150
PM2.5
2003
349
102
232
14
1
0
0
58
86
159
PM2.5
2002
347
105
227
14
1
0
0
58
82
170
PM2.5
2001
346
107
226
11
2
0
0
59
87
158
PM2.5
2000
289
97
184
8
0
0
0
58
81
148
PM2.5
What this data can and can’t tell you
It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.
It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.
Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.
Counties in Pennsylvania with a similar median AQI in 2025
