Air pollutants can be transported to the pristine regions such as the Tibetan Plateau, by monsoon and stratospheric intrusion. The Tibetan Plateau region has limited local anthropogenic emissions, while this region is influenced strongly by transport of heavy emissions mainly from South Asia. We conducted a comprehensive study on various air pollutants (PM_2.5, total gaseous mercury, and surface ozone) at Nam Co Station in the inland Tibetan Plateau. Monthly mean PM_2.5 concentration at Nam Co peaked in April before monsoon season, and decreased during the whole monsoon season (June–September). Monthly mean total gaseous mercury concentrations at Nam Co peaked in July and were in high levels during monsoon season. The Indian summer monsoon acted as a facilitator for transporting gaseous pollutants (total gaseous mercury) but a suppressor for particulate pollutants (PM_2.5) during the monsoon season. Different from both PM_2.5 and total gaseous mercury variabilities, surface ozone concentrations at Nam Co are primarily attributed to stratospheric intrusion of ozone and peaked in May. The effects of the Indian summer monsoon and stratospheric intrusion on air pollutants in the inland Tibetan Plateau are complex and require further studies.

空气污染物可以通过季风和平流层的侵入被输送到青藏高原等原始地区。青藏高原地区局部人为排放量有限，而该地区受主要来自南亚的重排放运输的影响很大。我们对青藏高原内陆纳木错站的各种空气污染物（PM _2.5、总气态汞和地表臭氧）进行了综合研究。每月平均 PM _2.5Nam Co 的浓度在季风季节之前的 4 月达到峰值，并在整个季风季节（6 月至 9 月）期间下降。Nam Co 的月平均总气态汞浓度在 7 月达到峰值，并在季风季节处于高水平。印度夏季风在季风季节起到了运输气态污染物（总气态汞）的促进作用，但对颗粒污染物（PM _2.5）起到了抑制作用。与 PM _2.5和总气态汞变化不同，Nam Co 的地表臭氧浓度主要归因于臭氧的平流层侵入，并在 5 月达到峰值。印度夏季风和平流层入侵对青藏高原内陆空气污染物的影响复杂，需要进一步研究。