Daily Air Quality Index summaries from EPA monitors in Henry, Georgia, 1999–2025.
76%
Good days in 2025
39
Median daily AQI, 2025
0
Days above 100 in 2025
361
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Henry, Georgia on 361 days. 273 of those days (76%) were in the Good range, and the median daily AQI was 39. That median is lower than the typical monitored county in Georgia (median 46 across 25 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 214 days. Across the years with fuller monitoring, the share of Good days rose: an average of 55% in 1999–2001 versus 71% 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)
214
59%
Ozone
147
41%
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
361
273
88
0
0
0
0
39
56
74
PM2.5
2024
364
269
89
6
0
0
0
40
62
133
PM2.5
2023
361
226
128
6
1
0
0
44
63
153
PM2.5
2022
351
262
86
3
0
0
0
40
60
105
PM2.5
2021
360
259
100
1
0
0
0
39
63
112
PM2.5
2020
366
291
75
0
0
0
0
36
55
96
PM2.5
2019
363
234
122
7
0
0
0
43
64
150
PM2.5
2018
354
246
105
3
0
0
0
38
60
115
PM2.5
2017
347
238
106
3
0
0
0
43
59
129
PM2.5
2016
365
238
118
8
1
0
0
44
64
159
PM2.5
2015
364
240
121
3
0
0
0
42
60
147
PM2.5
2014
351
185
160
5
1
0
0
48
64
159
PM2.5
2013
359
217
139
3
0
0
0
46
63
105
PM2.5
2012
355
166
178
5
5
1
0
52
69
218
PM2.5
2011
362
158
184
19
1
0
0
54
90
156
PM2.5
2010
365
157
203
3
2
0
0
53
74
159
PM2.5
2009
365
173
185
7
0
0
0
52
71
136
PM2.5
2008
364
126
217
15
6
0
0
55
84
192
PM2.5
2007
363
118
213
21
10
1
0
59
97
201
PM2.5
2006
364
95
237
25
7
0
0
61
97
195
PM2.5
2005
361
103
220
32
5
1
0
58
101
205
PM2.5
2004
348
91
231
23
3
0
0
58
90
179
PM2.5
2003
305
170
117
18
0
0
0
46
90
140
Ozone
2002
245
164
48
23
8
2
0
42
108
223
Ozone
2001
245
165
54
22
3
1
0
43
105
209
Ozone
2000
243
127
66
29
16
5
0
49
140
235
Ozone
1999
146
68
22
22
25
9
0
64
182
228
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 Georgia with a similar median AQI in 2025
