CalEnviroscreen Version 1.1 - OEHHA - State of California

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CalEnviroScreen 1.1 INDIVIDUAL INDICATORS: DESCRIPTION AND ANALYSIS 16
CalEnviroScreen 1.1 AIR QUALITY: OZONE Exposure Indicator Ozone pollution causes numerous adverse health effects, including respiratory irritation and lung disease. The health impacts of ozone and other criteria air pollutants (particulate matter (PM), nitrogen dioxide, carbon monoxide, sulfur dioxide, and lead) have been considered in the development of health-based standards. Of the six criteria air pollutants, ozone and particle pollution pose the most widespread and significant health threats. The California Air Resources Board maintains a wide network of air monitoring stations that provides information that may be used to better understand exposures to ozone and other pollutants across the state. Indicator Portion of the daily maximum 8-hour ozone concentration over the federal 8-hour standard (0.075 ppm), averaged over three years (2007 to 2009). Data Source Air Monitoring Network, California Air Resources Board (CARB) CARB, local air pollution control districts, tribes and federal land managers maintain a wide network of air monitoring stations in California. These stations record a variety of different measurements including concentrations of the six criteria air pollutants and meteorological data. In certain parts of the state, the density of the stations can provide high-resolution data for cities or localized areas around the monitors. However, not all cities have stations. The information gathered from each air monitoring station audited by the CARB includes maps, geographic coordinates, photos, pollutant concentrations, and surveys. http://www.arb.ca.gov/aqmis2/aqmis2.php http://www.epa.gov/airquality/ozonepollution/ http://www.niehs.nih.gov/health/topics/agents/ozone/ Rationale Ozone is an extremely reactive form of oxygen. In the upper atmosphere ozone provides protection against the sun’s ultraviolet rays. Ozone at ground level is the primary component of smog. Ground-level ozone is formed from the reaction of oxygen-containing compounds with other air pollutants in the presence of sunlight. Ozone levels are typically at their highest in the afternoon and on hot days (NRC, 2008). Adverse effects of ozone, including lung irritation, inflammation and exacerbation of existing chronic conditions, can be seen at even low exposures (Alexis et al. 2010, Fann et al. 2012, Zanobetti and Schwartz 2011). A long-term study in southern California found that rates of asthma hospitalization for children increased during warm season episodes of high ozone concentration (Moore et al. 2008). Additional studies have shown that the increased risk is higher among children under 2 years of age, young males, and African American children (Lin et al., 2008, Burnett et al., 2001). Increases in ambient ozone have also been 17
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CalEnviroscreen Version 1.1 - OEHHA - State of California

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