Additional examples are adjusted to the entries in an automated way - we cannot guarantee that they are correct.
'Smog masks' were worn by those who were able to purchase them from chemists.
The star hovered on a taxi, then on a cyclist in a smog mask, then on a traffic light.
But the passes were handed out by the thousands, and last November there were signs that things were deteriorating, as when traffic policemen flouted official prohibitions and donned smog masks while on duty.
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