3.12 Air Quality
Table 3.12-1
California and National Ambient Air Quality Standards
California Standards(1)
National Standards(2)
Pollutant
Averaging Time
Concentration(3)
Primary(3,4)
Secondary(3,5)
Same as Primary
0.09 ppm (180 :g/m3)
0.12 ppm (235 :g/m3)
1 Hour
Standard
Ozone (O3)
0.08 ppm6
8 Hour
8 Hour
9.0 ppm (10 mg/m3)
9.0 ppm (10 mg/m3)
Carbon Monoxide
-
(CO)
1 Hour
20 ppm (23 mg/m3)
35 ppm (40 mg/m3)
0.053 ppm (100 :g/m3)
Annual Average
-
Nitrogen Dioxide
Same as Primary
(NO2)
Standard
0.25 ppm (470 :g/m3)
1 Hour
-
80 :g/m3 (0.03 ppm)
Annual Average
-
-
0.04 ppm (105 :g/m3)
365 :g/m3 (0.14 ppm)
24 Hour
-
Sulfur Dioxide (SO2)
1300 :g/m3 (0.5 ppm)
3 Hour
-
-
0.25 ppm (655 :g/m3)
1 Hour
-
-
30 :g/m3
Annual Geometric Mean
-
-
50 :g/m3
150 :g/m3
Suspended Particulate
24 Hour
Matter (PM10)
-
50 :g/m3
Annual Arithmetic Mean
-
65 :g/m3
24 Hour
Fine Particulate
Matter (PM2.5)6
15 :g/m3
Annual Arithmetic Mean
1.5 :g/m3
30 Day Average
-
-
Lead (Pb)
Same as Primary
1.5 :g/m3
Calendar Quarter
-
Standard
25 :g/m3
Sulfates (SO4)
24 Hour
0.03 ppm (42 :g/m3)
1 Hour
Vinyl Chloride
0.010 ppm (26 :g/m3)
24 Hour
(chloroethene)
Visibility Reducing
8 Hour (10 am-6 pm,
Insufficient amount to produce an
Particles
Pacific Standard Time)
extinction coefficient of 0.23 per
No Federal Standards
kilometer visibility of ten miles or
more (0.07-30 miles or more for
Lake Tahoe) due to particles when
the relative humidity is less than 70
percent. Method: ARB Method V
(8/18/89).
Source: ARB Fact Sheet 39 (11/91); SCAQMD bulletin (8/97) and www.arb.ca.gov
(1)
California standards, other than ozone, carbon monoxide,
Ppm in this table refers to ppm by volume or micromoles of
sulfur dioxide (1 hour), nitrogen dioxide, PM10, are values that
pollutant per mole of gas.
(4)
are not to be equaled or exceeded.
The ozone, carbon
National Primary Standards: The levels of air quality necessary,
monoxide, sulfur dioxide (1 hour), nitrogen dioxide, and PM10
with an adequate margin of safety, to protect the public health.
standards are not to be exceeded.
Each state must attain the primary standards within a specified
National standards, other than ozone and those based on
(2)
number of years after that state's implementation plan is
annual averages or annual geometric means, are not to be
approved by the USEPA.
(5)
exceeded more than once a year.
The ozone standard is
National Secondary Standards:
The levels of air quality
attained when the expected number of days per calendar year
necessary to protect the public welfare from any known or
with maximum hourly average concentration s above standard
anticipated adverse effects of a pollutant. Each state must attain
is equal to or less than one.
the secondary standards within a "reasonable time" after the
(3)
Concentration expressed first in units in which it was
implementation plan is approved by the USEPA.
New federal 8-hour ozone and fine particulate matter standards
(6)
promulgated. Equivalent units given in parentheses are based
upon a reference temperature of 25C and a reference pressure
were promulgated by USEPA on July 18, 1997. The federal 1-
of 760 mm of mercury. All measurements of air quality are to
hour ozone standard continues to apply in areas that violated the
be corrected to a reference temperature of 25C and a
standard.
Contact USEPA for further clarification and current
reference pressure of 760 mm of mercury (1,013.2 millibar).
federal policies.
Regional Beach Sand Project EIR/EA
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