Sainte Genevieve County, Missouri air quality history
Daily Air Quality Index summaries from EPA monitors in Sainte Genevieve, Missouri, 1996–2025.
91%
Good days in 2025
41
Median daily AQI, 2025
2
Days above 100 in 2025
255
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Sainte Genevieve, Missouri on 255 days. 233 of those days (91%) were in the Good range, and the median daily AQI was 41. That median is about the same as the typical monitored county in Missouri (median 41 across 19 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 255 days. Across the years with fuller monitoring, the share of Good days rose: an average of 56% in 1996–1998 versus 87% in 2023–2025.
EPA did not report an AQI for every day of 2025 here (255 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.
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
Ozone
255
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
255
233
20
2
0
0
0
41
50
108
Ozone
2024
252
229
23
0
0
0
0
43
50
100
Ozone
2023
245
195
38
12
0
0
0
44
74
147
Ozone
2022
244
215
29
0
0
0
0
41
54
100
Ozone
2021
245
227
18
0
0
0
0
39
48
100
Ozone
2020
245
229
16
0
0
0
0
36
46
87
Ozone
2019
244
229
15
0
0
0
0
38
49
87
Ozone
2018
245
210
35
0
0
0
0
40
58
97
Ozone
2017
245
204
39
2
0
0
0
44
58
101
Ozone
2016
214
185
27
2
0
0
0
39
54
105
Ozone
2015
220
190
30
0
0
0
0
39
54
93
Ozone
2014
262
165
93
4
0
0
0
45
71
115
Ozone
2013
263
176
86
1
0
0
0
44
64
105
Ozone
2012
251
151
84
14
2
0
0
47
93
177
Ozone
2011
251
153
96
2
0
0
0
46
74
122
Ozone
2010
309
207
94
8
0
0
0
43
77
129
Ozone
2009
365
271
91
3
0
0
0
38
65
147
Ozone
2008
365
244
116
5
0
0
0
43
69
147
Ozone
2007
365
131
202
26
6
0
0
56
97
182
PM2.5
2006
363
145
207
9
2
0
0
54
80
164
PM2.5
2005
364
203
133
27
1
0
0
47
93
169
Ozone
2004
360
230
127
3
0
0
0
43
69
108
Ozone
2003
356
222
114
17
3
0
0
44
87
182
Ozone
2002
305
162
109
27
7
0
0
48
108
172
Ozone
2001
263
108
136
18
1
0
0
55
97
185
Ozone
2000
265
96
145
20
3
1
0
58
97
204
Ozone
1999
260
82
134
32
12
0
0
61
126
200
Ozone
1998
224
110
84
25
5
0
0
51
108
179
Ozone
1997
230
140
78
12
0
0
0
47
90
147
Ozone
1996
237
135
66
26
10
0
0
47
115
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 Missouri with a similar median AQI in 2025
