ozone season update and clean air action day, june 24, 2016 · surface transportation technical...
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Surface Transportation Technical Committee
Whitney VandiverAugust 26, 2016
OZONE SEASON UPDATE AND CLEAN AIR ACTION DAY, JUNE 24, 2016
^Not a full year of data, current as of 8/25/2016Source: TCEQ, http://www.tceq.state.tx.us/cgi-bin/compliance/monops/8hr_monthly.pl ppb = parts per billion
Exceedance Level indicates daily maximum eight-hour average ozone concentration.Exceedance Levels are based on Air Quality Index (AQI) thresholds established by the EPA for the for the revised ozone standard of 70 ppb.
= Additional level orange exceedance days under the revised standard that were not exceedances under the previous 75 ppb standard. (AQI level orange = 71-75 ppb)
Eight-Hour Ozone Exceedance Days Based on 70 ppb Standard2016 OZONE SEASON
21 1711
23
1117 13 16 15 18 14 16
10
28 24
12 11 155
2727
29
27
1916 24
3022 16 22
23
13
19 24
27
9
24
5
34
2828
19
29 27 22
36
26
9 811
5
209
5
3
5
1
5
86 4
62 3
4
2
2
3
0
10
20
30
40
50
60
70
80
90
100
Exce
edan
ce D
ays
Ozone Season (Year)
Orange (71-75 ppb)
Orange (76-85 ppb)
Red (86-105 ppb)
Purple (106+ ppb)
Exceedance Levels
2
102101
99100
98
9596
95
91
86 86
90
87 87
81 8380
60
65
70
75
80
85
90
95
100
105
- - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - -
Consecutive Three-Year Periods
Source: NCTCOG TR Dept
Des
ign
Valu
e (p
pb)1
1Attainment Goal - According to the US EPA National Ambient Air Quality Standards, attainment is reached when, at each monitor, the Design Value (three-year average of the annual fourth-highest daily maximum eight-hour average ozone concentration) is less than or equal to 70 parts per billion (ppb).
^Not a full year of data, current as of 8/25/2016.
2015 Revised Standard ≤ 70 ppb (TBD; Moderate by 2024)
2008 Standard ≤ 75 ppb1 (by 2017)
2016 OZONE SEASONEight-Hour Ozone Historical Trends
- - - - - - - - - - - - - - - - - - - - - - - - - -1997 Standard < 85 ppb (Revoked)
3
4
5
CONTACTS
Whitney VandiverCommunications [email protected]
Jody LozaSenior Air Quality [email protected]
www.airnorthtexas.org