During the west phase of the South Asia high, the low O3 air is difficult to transport to the top of the Tibetan Plateau and the low O3 is weak over the Tibetan Plateau.

在西部型南亚高压条件下，低纬度地区含低浓度o3的空气不易到达高原上空，青藏高原上空的O3低值较弱。

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In the north-west and centre of the Tibetan plateau Dr Xu and his team found that particularly high levels of soot had fallen on the glaciers during the 1950s.

ECONOMIST: Pollution in the Himalayas