Hebei's PM2.5 concentration drops 56.9% in 7 years

Hebei province's air quailty has improved remarkably in recent years, with its PM2.5 density decreasing from 104 mg/m³ in 2013 to 44.8 mg/m³ last year. It stood at 38 mg/m³ in the first 10 months this year, according to a press conference Wednesday.

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