PM10 , and PM2.5 . While air pollution levels vary from station to station , the entire air basin is designated either in attainment or nonattainment based on the total average level of pollutants within the basin . Therefore , the region must work together to achieve attainment .
Table 5.1‐1 shows pollutant levels for the San Francisco Bay Area Air Basin as well as station levels closest to Travis AFB . The most recent pollution levels for the San Francisco Area Air Basin available from the BAAQMD were from 2011 . The table also includes ambient air quality standards and attainment status . The San Francisco Bay Area Air Basin is designated nonattainment for state ozone standards , PM10 , and PM2.5 . For federal standards , the basin is designated nonattainment for 8‐hour ozone and PM2.5 . All other criteria pollutants are designated attainment or are unclassified .
Table 5.1‐2 contains past trends for ozone , PM2.5 , and PM10 for the San Francisco Bay Area Air Basin . Overall , pollutant levels in the Study Area have been slowly decreasing . Ozone levels have declined by an average of nearly 17 percent from 1992 to 2012 . PM2.5 concentrations have decreased 36 percent from 2001 to 2011 .
Ozone concentrations exceeded the NAAQS ( 8‐hour ) and CAAQS ( 1‐hour and 8‐hour ) every year in the San Francisco Bay Area Air Basin from 1992 to 2012 . 8‐hour ozone concentrations ranged from 0.073 to 0.087 parts per million ( ppm ) during the 12‐year timeframe , with the highest level ( 0.087 ppm ) recorded in 2000 . The lowest was recorded in 2012 , only 0.003 ppm above the state and national standard .
High levels of ozone are generally attributed to specific meteorological patterns combined with increases in emissions during summer months . Urban vehicle emissions , industrial emissions , and higher temperatures in the basin contribute to summer ozone generation and nonattainment of the state and federal ambient air quality standards . wind during dry conditions . Particulate matter l during winter because of cold temperatures an wood smoke , and windy conditions . 24‐hour PM from 55.4 to 113.9 micrograms per cubic meter CAAQS during the 12‐year time period . Howeve the 24‐hour PM10 NAAQS was not exceeded .
The San Francisco Bay Area has seen progress in 24‐hour PM2.5 concentrations in the basin rang 27 µ g / m3 in 2011 . Although the basin is design the 24‐hour national PM2.5 standard , recent m that the basin meets the 24‐hour PM2.5 standa “ clean data determination ” for the 24‐hour PM January 2013 . The basin must still meet the req to be redesignated to attainment .
While the San Francisco Bay Area Air Basin is cu most air pollutants , the EPA has the authority to which could bring levels into nonattainment . In proposed increasing the ozone standard from 0 0.065 to 0.070 ppm . During the public commen rule , many groups urged the EPA to keep the 0 . However , in October 2015 , under a court‐order finalized the ozone NAAQS standard at 0.070 pp
Travis AFB currently holds a Synthetic Minor Op acknowledges that its potential emissions could in the San Francisco Bay Area Air Basin but that below those levels . The permit allows Travis AF need for a higher‐level ( Title V ) permit with add self‐regulating their potential to emit .
Particulate matter is generated within the area by agricultural and industrial operations , construction activities , combustion of wood and fossil fuels , and
TSS Background Report