Daily Air Quality Index summaries from EPA monitors in Rensselaer, New York, 1980–2012.
93%
Good days in 2012
34
Median daily AQI, 2012
3
Days above 100 in 2012
346
Days with an AQI in 2012 (of 366)
In 2012, EPA reported a daily Air Quality Index (AQI) for Rensselaer, New York on 346 days. 323 of those days (93%) were in the Good range, and the median daily AQI was 34. 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 346 days. Across the years with fuller monitoring, the share of Good days rose: an average of 86% in 1980–1982 versus 92% 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.
Years with fewer than 120 monitored days (1994, 1995, 1996, 1997, 1998, 2001…) are shown in the table but left out of comparisons and trend statements.
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
346
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
346
323
20
3
0
0
0
34
49
108
Ozone
2011
351
335
15
1
0
0
0
34
46
140
Ozone
2010
357
311
40
6
0
0
0
36
58
122
Ozone
2009
364
340
21
3
0
0
0
34
47
122
Ozone
2008
358
319
34
5
0
0
0
34
51
147
Ozone
2007
350
310
30
10
0
0
0
33
61
136
Ozone
2006
351
314
31
6
0
0
0
32
51
129
Ozone
2005
337
283
39
14
1
0
0
39
64
187
Ozone
2004
356
309
34
11
2
0
0
38
61
190
Ozone
2003
346
286
51
7
2
0
0
38
64
172
Ozone
2002
353
281
39
19
11
3
0
36
97
208
Ozone
2001
25
25
0
0
0
0
0
21
26
28
Ozone
1998
57
56
1
0
0
0
0
16
33
54
PM10
1997
53
53
0
0
0
0
0
17
27
40
PM10
1996
60
59
1
0
0
0
0
17
25
51
PM10
1995
58
58
0
0
0
0
0
14
30
43
PM10
1994
50
49
1
0
0
0
0
16
33
53
PM10
1993
55
55
0
0
0
0
0
14
29
45
PM10
1992
60
58
2
0
0
0
0
19
31
55
PM10
1991
58
56
2
0
0
0
0
17
36
85
PM10
1990
30
30
0
0
0
0
0
18
42
44
PM10
1986
322
289
25
6
2
0
0
29
51
174
Ozone
1985
361
320
28
11
2
0
0
28
58
185
Ozone
1984
358
327
25
4
2
0
0
27
50
192
Ozone
1983
363
308
33
15
7
0
0
27
74
179
Ozone
1982
320
291
20
8
1
0
0
23
49
156
Ozone
1981
356
303
36
15
2
0
0
27
74
172
Ozone
1980
362
293
39
19
11
0
0
31
93
200
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
