Air purification needed

WHEN THE CITY STRUGGLES TO BREATH WHILE smothered in smog, all Beijingers can do is pray; either for some wind, rain, or snow to clear the air, or if this fails, that their air purifiers and facemasks will be able to protect them from the pollution.

Fortunately their prayers were answered on Wednesday and strong winds cleared the air.

However, this most unwelcome of visitors will all too soon return, as smog is a frequent guest on winter days.