Environmental Assessment
Table 6 - Existing Air Quality in the San Antonio Area (1991)
|
Pollutant |
NAAQS |
TACB Monitoring Station ID (e) |
|||||||
|
Averaging Time |
Standard (d,e) |
||||||||
|
Primary |
Secondary |
North |
Northwest |
Downtown |
Texas Cult. |
S.A. Airport |
East Kelly |
||
|
Ozone |
1 hour (a) |
0.12 ppm |
0.12 ppm |
0.010 ppm (f) |
0.110 (ppm) |
-- |
-- |
-- |
-- |
|
Carbon monoxide |
1 hour (b) |
35 ppm |
35 ppm |
7.1 (g) |
-- |
6.2 (g) |
-- |
-- |
-- |
|
8 hours (b) |
9 ppm |
9 ppm |
3.4 (h) |
-- |
3.2 (h) |
-- |
-- |
-- |
|
|
PM-10 |
24 hours (a) |
150 ug/m3 |
150 ug/m3 |
74 (i) |
-- |
-- |
111 (i) |
-- |
59 (i) |
|
Annual |
50 ug/m3 |
50 ug/m3 |
21 (j) |
-- |
-- |
29 (j) |
-- |
28 (j) |
|
|
Lead |
Quarter (c) |
1.5 ug/m3 |
1.5 ug/m3 |
-- |
-- |
-- |
0.03 (k) |
0.02 (k) |
-- |
Notes:
(a) Not to be exceeded on more than 3 days over 3 years.
(b) Not to be exceeded more than once per calendar year.
(c) Not to be exceeded.
(d) Primary NAAQS are levels of air quality which the U.S. Environmental Protection Agency (EPA) judges necessary, with an adequate margin of safety, to protect the public health. Secondary NAAQS are levels of air quality which the EPA judges necessary to protect public welfare from any known anticipated adverse effects.
(e) Units are parts per million (ppm) for gases and micrograms per cubic meter (ug/m3) for PM-10 and lead.
(f) Highest hour.
(g) Highest second hour.
(h) Highest second 8-hour.
(i) Highest day.
(j) Arithmetic mean.
(k) Quarterly average.