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7.A. - Page 143 �/holesale Redwood City GDF Expansion Air Quality/Climate Change Analysis Page 8 Table 1. Ambient Air Quality Standards. California Standards Federal Standards Pollutant Averaging Time Concentration Prima Secondar ° Ozone (03) 1 Hour 0.09 m 180 /m — Same as Primary 8 Hour 0.070 m 137 /m 0.075 m 147 /m Standard Respirable 24 Hour 50 /m 150 /m Same as Primary Particulate Annual 20 �g�ms _ Standard Matter(PM�o) Arithmetic Mean Fine 24 Hour — 35 /m Same as Primary Particulate Annual 12 �ag/m3 15.0 �ag/m3 Standard Matter(PMz.$) Arithmetic Mean Carbon Mon- 8 Hour 9.0 m 10 m /m 9 m 10 m /m None oxide (CO) 1 Hour 20 m 23 m /m 35 m 40 m /m Annual s 53 ppb(100 �ag/m ) Same as Primary Nitrogen Arithmetic Mean 0.030 ppm(57 �ag/m ) see Note 6 Standard Dioxide (NOz) 1 Hour 0.18 ppm(339 �ag/m3) 100 ppb(188�ag/m ) None see Note 6 24 Hour 0.04 m 105 /m — — Sulfur Dioxide 3 Hour — _ 0.5 ppm(1300 �ag/m ) (SOz) see Note 7 1 Hour 0.25 ppm(655 �ag/m3) 75 ppb(196 �ag/m ) _ see Note 7 30 Da Avera e 1.5 /m — — Lead Cal. Quarter — 1.5 /m Same as Primary Rollin 3-Mo.Av . — 0.15 /m Standard Visibility Extinction coefficient of Reducing 8 Hour 0.23/km @ less than 70% No Particles relative humidit Federal Sulfates 24 Hour 25 /m Standards Hydrogen 1 Hour 0.03 ppm(42 �ag/m3) Sulfide Notes: 1. California standards for ozone,carbon monoxide,sulfur dioxide(1 and 24 hour),nitrogen dioxide,and suspended particulate matter(PM,o, PM2.5,and visibility reducing particles)are values that are not to be exceeded. All others are not to be equaled orexceeded. 2. Federal standards(other than ozone, particulate matter,and those based on annual averages or annual arithmetic mean)are not to be exceeded more than once a year. The ozone standard is attained when the fourth highest eight hour concentration in a year,averaged over three years,is equal to or less than the standard. For PM,o,the 24 hour standard is attained when the expected number of days per calendar year with a 24-hour average concentration above 150�ag/m3 is equal to or less than one. For PM2.5,the 24 hour standard is attained when 98 percent of the daily concentrations,averaged over three years,are equal to or less than the standard. 3. Standards are expressed first in units in which they were promulgated. Equivalent units given in parentheses are based upon a reference temperature of 25°C and a reference pressure of 760 torr. Most measurements of air quality are to be corrected to a reference temperature of 25°C and a reference pressure of 760 torr; ppm in this table refers to ppm by volume,or micromoles of pollutant per mole of gas. 4. Federal Primary Standards: levels of air quality necessary,with an adequate margin of safety to protect the public health. 5. Federal Secondary Standards: levels of air quality necessary to protect the public welfare from any known or anticipated adverse effects of a pollutant. 6. To attain this standard,the 3-year average of the 98th percentile of the daily maximum 1-hour average at each monitor within an area must not exceed 0.100 ppm(effective April 12,2010). Note that the EPA standards are in units of parts per billion (ppb). California standards are in units of parts per million(ppm). To directly compare the federal standards to the California standards the units can be converted from ppb to ppm. In this case,the federal standards of 53 ppb and 100 ppb are identical to 0.053 ppm and 0.100 ppm, respectively. 7. On June 2,2010,the U.S. EPA established a new 1-hour SOZ standard,effective August 23,2010,which is based on the 3- year average of the annual 99th percentile of 1-hour daily maximum concentrations. The EPA also revoked both the existing 24-hour SOZ standard of 0.14 ppm and the annual primary SOZ standard of 0.030 ppm,effective August 23,2010. The secondary SOZ standard was not revised at that time; however,the secondary standard is undergoing a separate review by EPA. Note that the new standard is in units of parts per billion(ppb).California standards are in units of parts per million (ppm). To directly compare the new primary federal standard to the California standard the units can be converted to ppm. In this case,the federal standard of 75 ppb is identical to 0.075 ppm. Source: CARB,2010. 7/30/2012