Entire Book - Southwest Consortium for Environmental Research ...
Entire Book - Southwest Consortium for Environmental Research ...
Entire Book - Southwest Consortium for Environmental Research ...
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<strong>Environmental</strong> Regulation and the Border<br />
Table 2. Comparison of U.S. and Mexican Federal<br />
Standards<br />
Pollutant Symbol Units<br />
Carbon<br />
Monoxide<br />
Nitrogen<br />
Dioxide<br />
Particulate<br />
Matter<br />
Particulate<br />
Matter<br />
(CO) ppm*<br />
(NO 2) ppm*<br />
(PM 2.5) µg/m 3<br />
(PM 10) µg/m 3<br />
Ozone (O 3) ppm*<br />
Sulfur<br />
Dioxide<br />
(SO 2) ppm*<br />
Averaging<br />
Time<br />
Lead (Pb) µg/m 3 Calendar<br />
Quarter (b)<br />
Total<br />
Suspended<br />
Particles<br />
a) Not to be at or above the standard more than once per calendar year<br />
b) Not to be at or above the standard<br />
c) The three-year average of the annual 99th percentile <strong>for</strong> each monitor within an area<br />
d) The three-year average of the annual arithmetic mean concentrations at each monitor<br />
within an area<br />
e) The average of the annual four highest daily eight-hour maximums over a three-year<br />
period is not to be at or above the standard<br />
* ppm = parts per million<br />
** Primary standards are adopted to protect public health and secondary standards to protect<br />
public welfare<br />
Sources: EPA; SEMARNAT<br />
55<br />
U.S. Federal Standards<br />
Primary<br />
Standards**<br />
Secondary<br />
Standards**<br />
Mexican<br />
Federal<br />
Standards<br />
General<br />
Standards<br />
1 hr (a) 35.5 35.5<br />
8 hr (a) 9.5 9.5 11<br />
1 hr (a) 0.25 0.21<br />
Annual<br />
Mean<br />
0.054 0.054<br />
24 hr (c) 66 66<br />
3 yr Annual<br />
Average<br />
15.1 15.1<br />
24 hr (c) 150 150 150<br />
Annual<br />
Mean (d)<br />
50 50 50<br />
1 hr (a) 0.125 0.125 0.11<br />
8 hr (e) 0.085 0.085<br />
3 hr (a) 0.55<br />
24 hr (a) 0.145 0.13<br />
Annual<br />
Mean<br />
0.035 0.03<br />
1.55 1.55 1.5<br />
(TSP) µg/m 3 24 hr (a) 260