Specifically, Shanghai aims to further improve its annual average PM2.5 concentration to around 25 micrograms per cubic meter by 2030, a 4 percent improvement over the level achieved during the 14th …
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The Shanghai News
Specifically, Shanghai aims to further improve its annual average PM2.5 concentration to around 25 micrograms per cubic meter by 2030, a 4 percent improvement over the level achieved during the 14th …
( read original story …)