Daily Air Quality Index summaries from EPA monitors in Chemung, New York, 1980–2012.
90%
Good days in 2012
33
Median daily AQI, 2012
4
Days above 100 in 2012
352
Days with an AQI in 2012 (of 366)
In 2012, EPA reported a daily Air Quality Index (AQI) for Chemung, New York on 352 days. 318 of those days (90%) were in the Good range, and the median daily AQI was 33. That median is lower than the typical monitored county in New York (median 40.5 across 32 counties), and lower than the typical monitored U.S. county (44). The main pollutant was ozone on 352 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 87% in 1980–1982 versus 90% in 2010–2012.
The most recent year with data for this county is 2012; EPA's files for 2013–2025 contain no row for it, which usually means its monitors stopped reporting.
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, 2012
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
Ozone
352
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
2012
352
318
30
4
0
0
0
33
49
115
Ozone
2011
347
312
34
1
0
0
0
36
51
105
Ozone
2010
363
323
37
3
0
0
0
35
54
122
Ozone
2009
363
340
23
0
0
0
0
33
47
97
Ozone
2008
361
331
27
3
0
0
0
33
49
147
Ozone
2007
357
312
40
5
0
0
0
34
58
122
Ozone
2006
359
330
28
1
0
0
0
31
49
115
Ozone
2005
339
302
34
3
0
0
0
33
54
119
Ozone
2004
354
331
21
2
0
0
0
33
47
101
Ozone
2003
359
319
34
5
1
0
0
32
54
164
Ozone
2002
350
277
49
20
4
0
0
36
84
177
Ozone
2001
342
270
54
17
1
0
0
36
80
151
Ozone
2000
346
307
33
5
1
0
0
33
54
161
Ozone
1999
347
280
51
14
2
0
0
37
77
151
Ozone
1998
338
264
63
9
2
0
0
35
77
164
Ozone
1997
339
305
27
7
0
0
0
31
51
119
Ozone
1996
344
302
38
3
1
0
0
31
58
166
Ozone
1995
353
307
36
10
0
0
0
31
58
136
Ozone
1994
350
310
31
9
0
0
0
31
54
136
Ozone
1993
356
316
32
8
0
0
0
31
58
150
Ozone
1992
351
324
22
5
0
0
0
28
47
143
Ozone
1991
360
277
60
17
6
0
0
35
87
182
Ozone
1990
356
302
41
13
0
0
0
31
67
150
Ozone
1989
258
226
25
6
1
0
0
29
58
169
Ozone
1988
352
278
44
12
15
3
0
32
87
213
Ozone
1987
335
281
41
11
2
0
0
32
71
177
Ozone
1986
341
305
28
7
1
0
0
31
51
151
Ozone
1985
350
302
39
8
1
0
0
32
61
159
Ozone
1984
344
310
24
10
0
0
0
29
50
140
Ozone
1983
321
254
52
10
5
0
0
30
77
182
Ozone
1982
363
326
31
5
1
0
0
30
51
166
Ozone
1981
362
314
36
10
2
0
0
25
61
161
Ozone
1980
365
313
38
12
2
0
0
29
61
187
Ozone
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 New York with a similar median AQI in 2012
