Impacts of Indian summer monsoon and stratospheric intrusion on air pollutants in the inland Tibetan Plateau

Air pollutants can be transported to the pristine regions such as Tibetan Plateau, by monsoon and stratospheric intrusion. The Plateau region has limited local anthropogenic emissions, while this is influenced strongly transport of heavy emissions mainly from South Asia. We conducted a comprehensive study on various air (PM2.5, total gaseous mercury, surface ozone) at Nam Co Station in inland Plateau. Monthly mean PM2.5 concentration peaked April before season, decreased during whole season (June–September). mercury concentrations July were high levels season. Indian summer acted facilitator for transporting (total mercury) but suppressor particulate (PM2.5) Different both variabilities, ozone are primarily attributed intrusion May. effects complex require further studies.