Daily Air Quality Index summaries from EPA monitors in Orleans, Louisiana, 1980–2025.
71%
Good days in 2025
42
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 Orleans, Louisiana on 365 days. 259 of those days (71%) were in the Good range, and the median daily AQI was 42. That median is about the same as the typical monitored county in Louisiana (median 42 across 21 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 340 days. Across the years with fuller monitoring, the share of Good days fell: an average of 77% in 1980–1982 versus 70% 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)
340
93%
Nitrogen dioxide (NO₂)
23
6%
Coarse particles (PM10)
2
1%
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
259
106
0
0
0
0
42
55
71
PM2.5
2024
366
257
108
1
0
0
0
41
57
105
PM2.5
2023
365
248
117
0
0
0
0
41
59
90
PM2.5
2022
365
286
77
2
0
0
0
35
56
102
PM2.5
2021
357
308
49
0
0
0
0
33
53
69
PM2.5
2020
366
297
69
0
0
0
0
33
55
90
PM2.5
2019
365
292
73
0
0
0
0
36
57
90
PM2.5
2018
365
209
156
0
0
0
0
46
63
87
PM2.5
2017
365
191
174
0
0
0
0
49
58
98
PM2.5
2016
366
183
183
0
0
0
0
51
58
73
PM2.5
2015
365
229
136
0
0
0
0
46
59
79
PM2.5
2014
364
246
115
3
0
0
0
43
61
115
PM2.5
2013
362
261
99
2
0
0
0
41
59
115
PM2.5
2012
358
173
182
3
0
0
0
51
67
112
PM2.5
2011
365
225
135
4
1
0
0
46
65
162
PM2.5
2010
365
193
168
4
0
0
0
49
67
140
PM2.5
2009
365
172
190
3
0
0
0
52
64
119
PM2.5
2008
345
173
168
4
0
0
0
50
66
136
PM2.5
2007
336
157
179
0
0
0
0
52
67
92
PM2.5
2006
278
90
187
1
0
0
0
56
75
113
PM2.5
2005
311
99
209
3
0
0
0
56
76
136
PM2.5
2004
366
130
231
5
0
0
0
54
72
125
PM2.5
2003
365
117
242
6
0
0
0
55
73
143
PM2.5
2002
364
151
211
2
0
0
0
53
66
112
PM2.5
2001
365
120
240
5
0
0
0
55
76
122
PM2.5
2000
366
108
236
22
0
0
0
56
88
147
PM2.5
1999
365
203
150
12
0
0
0
47
82
133
NO2
1998
365
286
70
8
1
0
0
39
64
151
NO2
1997
365
296
67
2
0
0
0
37
58
129
NO2
1996
366
308
52
6
0
0
0
36
58
147
NO2
1995
365
278
80
7
0
0
0
40
70
133
NO2
1994
365
298
62
3
2
0
0
39
58
192
NO2
1993
365
290
69
6
0
0
0
38
61
133
NO2
1992
366
282
80
4
0
0
0
42
62
143
NO2
1991
365
302
60
3
0
0
0
37
61
126
NO2
1990
365
254
105
6
0
0
0
40
73
150
Ozone
1989
365
274
89
1
1
0
0
39
64
182
NO2
1988
366
244
96
23
3
0
0
44
80
166
NO2
1987
365
216
136
12
1
0
0
47
80
159
NO2
1986
365
172
186
7
0
0
0
52
72
150
NO2
1985
365
220
135
10
0
0
0
47
68
147
NO2
1984
366
184
168
14
0
0
0
50
77
143
NO2
1983
355
235
113
7
0
0
0
44
72
119
NO2
1982
365
260
99
4
2
0
0
43
68
190
NO2
1981
364
250
96
17
1
0
0
42
78
154
Ozone
1980
298
269
24
2
3
0
0
18
50
174
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 Louisiana with a similar median AQI in 2025
