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<p><strong>Abstract.</strong> Heavy regional particulate matter (PM) pollution in China has resulted in an important and urgent need for joint control actions among cities. It is advisable to improve the understanding of the regional background concentration of PM for the development of efficient and effective joint control policies. With the increase of height the influence of source emission on local air quality decreases with altitude, but the characteristics of regional pollution graduallydoi:10.5194/acp-15-11165-2015 fatcat:7ttwt67uxbbpzj3e4a6yavsmxy