Draft Environmental Impact Report - California Off Highway Vehicle ...

3.2 Air Quality
TABLE 3.2­1. SUMMARY OF ANNUAL AMBIENT AIR Quality DATA a
Ozone (O3)
2008
NAAQS/
CAAQS
2009
NAAQS/
CAAQS
2010
NAAQS/
CAAQS
Maximum concentration (1‐hour/8‐hour, ppm) 0.111/0.096 0.080/0.073 0.077/0.071
Number of days state standard exceeded (1‐hour/8‐hour) 2/14 0/2 0/1
Number of days national standard exceeded (8‐hour) b 6 0 0
Carbon Monoxide (CO)
Maximum concentration (1‐hour/8‐hour, ppm) 3.1/2.74 –/2.35 –/2.35
Number of days state standard exceeded (8‐hour) 0 0 0
Number of days national standard exceeded (1‐hour/8‐hour) 0/0 –/0 –/0
Nitrogen Dioxide (NO2)
Maximum concentration (1‐hour, ppm) 0.048 0.037 0.037
Number of days state standard exceeded 0 0 0
Annual average (ppm) 0.009 0.008 0.008
Fine Particulate Matter (PM2.5)
Maximum concentration (24‐hour, μg/m 3 ) (National/California c ) 107.6/190.9 35.1/59.2 31.9/39.8
Number of days national standard exceeded (measured/calculated d ) e 6/36.5 0/0.0 0/0.0
Annual average (μg/m 3 ) (National/California) 16.4/18.1 10.0/12.9 8.0/10.8
Respirable Particulate Matter (PM10)
Maximum concentration (24‐hour, μg/m 3 ) (National/California c ) 143.5/140.8 48.2/47.7 38.3/40.9
Number of days state standard exceeded (measured/calculated d ) 6/37.0 0/0.0 0/0.0
Number of days national standard exceeded (measured/calculated e ) 0/0.0 0/0.0 0/0.0
Annual average (μg/m3 ) (National/California) 27.3/27.6 –/20.1 –/17.0
Notes: μg/m3 = micrograms per cubic meter; ppm = parts per million; — = data not available or insufficient data to
determine value
a Measurements were recorded at the Manzanita Avenue monitoring station in Chico, CA.
b The 8‐hour national ozone standard was revised to 0.075 ppm in March 2008. Statistics shown are based on the
previous 0.08 ppm standard. The 1‐hour national ozone standard was revoked on June 15, 2005. Statistics for the
1‐hour national ozone standard are shown for informational purposes.
c State and national statistics may differ because state statistics are based on California‐approved samplers,
whereas national statistics are based on samplers using federal reference or equivalent methods. State and
national statistics may therefore be based on different samplers. State statistics are based on local conditions,
while national statistics are based on standard conditions. State criteria for ensuring that data are sufficiently
complete for calculating valid annual averages are more stringent than the national criteria.
d Measured days are those days that an actual measurement was greater than the level of the state daily standard or
the national daily standard. Measurements are typically collected every 6 days. Calculated days are the estimated
number of days that a measurement would have been greater than the level of the standard had measurements
been collected every day. The number of days above the standard is not necessarily the number of violations of the
standard for the year.
e The national 24‐hour standard for particulate matter with an aerodynamic resistance diameter of 2.5 micrometers
or less was revised from 65 µg/m3 to 35 µg/m3 in 2006. Statistics shown are based on the 65 µg/m3 standard.
Sources: CARB 2011c; EPA 2011
Clay Pit State Vehicular Recreation Area
February 2012 3.2-2 Draft EIR