Daily Air Quality Index summaries from EPA monitors in Clarke, Georgia, 1999–2025.
58%
Good days in 2025
46
Median daily AQI, 2025
0
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Clarke, Georgia on 365 days. 211 of those days (58%) were in the Good range, and the median daily AQI was 46. That median is about the same as the typical monitored county in Georgia (median 46 across 25 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 267 days. Across the years with fuller monitoring, the share of Good days rose: an average of 42% in 2002–2004 versus 55% in 2023–2025.
Years with fewer than 120 monitored days (1999, 2000, 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, 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)
267
73%
Ozone
98
27%
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
365
211
154
0
0
0
0
46
63
89
PM2.5
2024
364
222
140
2
0
0
0
46
62
126
PM2.5
2023
365
173
189
3
0
0
0
52
71
147
PM2.5
2022
362
201
161
0
0
0
0
47
63
88
PM2.5
2021
365
195
169
1
0
0
0
49
65
107
PM2.5
2020
366
249
117
0
0
0
0
44
59
99
PM2.5
2019
365
171
194
0
0
0
0
52
65
87
PM2.5
2018
332
207
123
2
0
0
0
46
61
105
PM2.5
2017
360
249
111
0
0
0
0
43
58
97
PM2.5
2016
362
241
115
4
2
0
0
44
64
166
PM2.5
2015
358
229
129
0
0
0
0
44
59
97
PM2.5
2014
356
164
192
0
0
0
0
52
65
93
PM2.5
2013
365
197
168
0
0
0
0
47
65
92
PM2.5
2012
366
169
191
5
1
0
0
52
70
153
PM2.5
2011
365
156
195
14
0
0
0
53
83
126
PM2.5
2010
365
153
207
5
0
0
0
54
77
147
PM2.5
2009
363
169
192
2
0
0
0
52
68
112
PM2.5
2008
362
132
218
12
0
0
0
55
82
140
PM2.5
2007
357
103
226
26
2
0
0
59
93
156
PM2.5
2006
365
88
247
25
5
0
0
61
100
161
PM2.5
2005
364
101
246
15
2
0
0
59
90
161
PM2.5
2004
326
129
181
14
2
0
0
56
87
174
PM2.5
2003
249
118
124
7
0
0
0
51
80
150
Ozone
2002
226
85
113
25
2
1
0
58
105
219
Ozone
2001
100
18
79
2
1
0
0
63
86
175
PM2.5
2000
92
4
83
5
0
0
0
67
86
142
PM2.5
1999
99
11
83
4
1
0
0
67
98
176
PM2.5
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
