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Small particulate matter (PM2.5) pollution has health impacts even at very low concentrations. WHO recommended guideline values are shown in Table 1, above which there will be concern for human health. Fig 2 shows the annual median concentration of PM2.5, in μg/m 3, in different countries of the world as per WHO.

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While a number of air pollutants are associated with significant mortality, including NOx, ozone, carbon monoxide, and sulphur dioxide, particulate matter (PM2.5) is most commonly used as the proxy indicator of exposure to air pollution, and has been most closely studied (WHO Guideline, 2005).

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For PM2 5, the summer concentrations are considerably higher than the other season. These profiles of hourly average PM25 and PM10_25 levels are typical of many, but not all, eastern U.S. urban areas. Figure 2-29 shows hourly average PM2 5 and PM10_2 5 concentrations for a monitoring site in the Denver metropolitan area from 2001-2003.

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