ABCDEFGHIJKLMNOPQRSTUVWXYZ
1
YearNumber of Ozone Action Alert DaysNotes:
2
201130
3
201243
These are Ozone Action Day Alerts issued during the traditional summer ozone season,
4
201333
which runs from May 31-August 31
5
201418
6
201525
From 2011-2015, the national ozone standard was 75 parts per billion over an 8-hour average
7
201636
8
201745
From 2016-present, the national ozone standard is 70 parts per billion over an 8-hour average
9
201852
10
201932
Disclaimer: Considering that the national ozone standard was higher prior to 2016, more Ozone Action Day Alerts
11
202043
should be expected from 2016-present assuming similar meteorological conditions and emissions from year to year
12
202165
13
202228
14
2022 numbers are up-to-date as of 8/8/22
15
16
See the "2021 dates" or "2022 dates" tab below for a day-by-day breakdown of each ozone season
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100