including motor vehicles and boilers used for heating; the elemental composition of PM2.5 can vary by source and determine PM2.5 health effects. The number of people exposed to pollution above the highest WHO Interim Target could fall by 80% to 430 million. Furthermore, premature mortality from outdoor air pollution could decline by about a third, and an additional 2 million premature deaths a year from indoor air pollution could be avoided. In addition to its impacts on human health and well-being, air pollution also threatens agricultural productivity and food security in the region, which is home to approximately 60% of the global total of undernourished people. While existing laws and policies have made progress in reducing air pollution in the region, further action is needed to bring air quality to safe levels. Ozone can irritate the airways of both healthy people and those with lung conditions. High levels can cause discomfort when you breathe, reduce your lung capacity and trigger asthma symptoms. lists the criteria pollutants and the federal and California standards. In most cases, the California
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