Daily Air Quality Index summaries from EPA monitors in Tuscaloosa, Alabama, 1980–2025.
74%
Good days in 2025
41
Median daily AQI, 2025
0
Days above 100 in 2025
360
Days with an AQI in 2025 (of 365)
In 2025, EPA reported a daily Air Quality Index (AQI) for Tuscaloosa, Alabama on 360 days. 265 of those days (74%) were in the Good range, and the median daily AQI was 41. That median is about the same as the typical monitored county in Alabama (median 41 across 14 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 257 days. Across the years with fuller monitoring, the share of Good days rose: an average of 70% in 1980–1982 versus 77% in 2023–2025.
Years with fewer than 120 monitored days (1995, 1996, 1997, 1998, 1999, 2000…) 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)
257
71%
Ozone
103
29%
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
360
265
95
0
0
0
0
41
56
93
PM2.5
2024
359
318
39
2
0
0
0
37
53
125
PM2.5
2023
365
255
110
0
0
0
0
42
60
87
PM2.5
2022
280
240
40
0
0
0
0
37
54
87
Ozone
2021
280
246
34
0
0
0
0
34
52
90
Ozone
2020
278
247
31
0
0
0
0
34
52
97
Ozone
2019
264
217
47
0
0
0
0
39
54
87
Ozone
2018
320
223
96
1
0
0
0
42
60
115
Ozone
2017
350
92
257
1
0
0
0
57
71
123
PM2.5
2016
365
107
258
0
0
0
0
54
63
100
PM2.5
2015
357
94
263
0
0
0
0
56
67
91
PM2.5
2014
280
224
56
0
0
0
0
38
56
93
Ozone
2013
281
227
54
0
0
0
0
40
56
72
Ozone
2012
283
226
57
0
0
0
0
39
56
93
Ozone
2011
279
206
72
1
0
0
0
40
61
103
Ozone
2010
365
47
318
0
0
0
0
60
75
90
PM2.5
2009
306
172
133
1
0
0
0
46
65
120
PM2.5
2008
267
184
82
1
0
0
0
43
64
101
Ozone
2007
274
135
121
16
2
0
0
51
93
159
Ozone
2006
277
138
131
7
1
0
0
51
81
161
Ozone
2005
274
141
123
9
1
0
0
50
83
164
Ozone
2004
275
172
101
2
0
0
0
44
71
115
Ozone
2003
279
177
100
2
0
0
0
44
67
119
Ozone
2002
252
193
45
12
2
0
0
40
74
166
Ozone
2001
242
176
56
9
1
0
0
42
77
192
Ozone
2000
107
21
82
4
0
0
0
61
86
126
PM2.5
1999
115
17
91
7
0
0
0
65
94
125
PM2.5
1998
60
60
0
0
0
0
0
25
41
49
PM10
1997
60
58
2
0
0
0
0
21
41
58
PM10
1996
54
51
3
0
0
0
0
24
38
57
PM10
1995
61
58
3
0
0
0
0
24
44
57
PM10
1994
58
58
0
0
0
0
0
23
38
49
PM10
1993
54
52
2
0
0
0
0
23
40
57
PM10
1992
51
51
0
0
0
0
0
21
35
42
PM10
1991
60
55
5
0
0
0
0
22
46
79
PM10
1990
56
49
7
0
0
0
0
27
54
66
PM10
1989
42
40
2
0
0
0
0
26
44
53
PM10
1982
190
125
49
15
1
0
0
44
100
151
Ozone
1981
228
169
47
12
0
0
0
42
84
140
Ozone
1980
132
94
28
10
0
0
0
38
93
147
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 Alabama with a similar median AQI in 2025
