Daily Air Quality Index summaries from EPA monitors in Schenectady, New York, 1980–2011.
96%
Good days in 2011
34
Median daily AQI, 2011
1
Days above 100 in 2011
180
Days with an AQI in 2011 (of 365)
In 2011, EPA reported a daily Air Quality Index (AQI) for Schenectady, New York on 180 days. 172 of those days (96%) 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 38.5 across 34 counties), and lower than the typical monitored U.S. county (44). The main pollutant was ozone on 180 days. Across the years with fuller monitoring, the share of Good days rose: an average of 90% in 1980–1982 versus 95% in 2009–2011.
EPA did not report an AQI for every day of 2011 here (180 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.
The most recent year with data for this county is 2011; EPA's files for 2012–2025 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, 2011
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
180
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
2011
180
172
7
1
0
0
0
34
45
108
Ozone
2010
365
341
21
3
0
0
0
31
46
122
Ozone
2009
361
351
9
1
0
0
0
29
45
112
Ozone
2008
366
348
14
3
1
0
0
27
45
151
Ozone
2007
364
340
22
2
0
0
0
28
44
143
Ozone
2006
365
354
10
1
0
0
0
26
41
101
Ozone
2005
365
332
26
7
0
0
0
31
49
147
Ozone
2004
366
348
15
3
0
0
0
28
44
136
Ozone
2003
365
319
40
4
2
0
0
31
58
182
Ozone
2002
365
281
67
13
4
0
0
34
72
200
Ozone
2001
365
274
75
15
1
0
0
36
72
159
Ozone
2000
366
302
60
3
1
0
0
32
61
159
Ozone
1999
364
296
55
11
2
0
0
33
67
179
Ozone
1998
365
325
37
3
0
0
0
30
51
136
Ozone
1997
364
337
17
9
1
0
0
30
46
151
Ozone
1996
366
342
21
3
0
0
0
28
45
150
Ozone
1995
365
323
26
15
1
0
0
30
58
161
Ozone
1994
365
326
35
4
0
0
0
31
51
122
Ozone
1993
363
333
23
4
3
0
0
30
49
185
Ozone
1992
366
330
26
6
4
0
0
29
50
187
Ozone
1991
355
317
25
12
1
0
0
30
54
164
Ozone
1990
365
323
35
5
2
0
0
30
58
161
Ozone
1989
364
317
39
6
2
0
0
29
58
174
Ozone
1988
366
313
28
11
13
1
0
30
71
206
Ozone
1987
343
305
29
9
0
0
0
28
52
140
Ozone
1986
362
327
31
4
0
0
0
27
50
140
Ozone
1985
365
314
34
11
6
0
0
31
64
195
Ozone
1984
366
327
31
7
0
1
0
29
52
204
Ozone
1983
365
303
46
12
4
0
0
28
71
174
Ozone
1982
365
308
39
12
6
0
0
31
64
182
Ozone
1981
364
331
28
5
0
0
0
26
49
136
Ozone
1980
366
349
15
2
0
0
0
24
43
115
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 2011
