A woman wears a mask as smog continues to choke Beijing in this January file photo. Photo: AP
A woman wears a mask as smog continues to choke Beijing in this January file photo. Photo: AP

Hot, smoggy weekend for Beijing as heavy ozone pollution hits

Ozone, a key element in forming photochemical smog, will be the main pollutant as weeks of clear skies finally yield to heavy air pollution

A woman wears a mask as smog continues to choke Beijing in this January file photo. Photo: AP
A woman wears a mask as smog continues to choke Beijing in this January file photo. Photo: AP
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