Mrs. Zhang (62), a retiree in Beijing, stands near a wall in the capital's Ditan Park. "Last year I bought a professional mask because I had a bad throat. The pollution made it worse. I think they are a bit strange looking. These past two years I've been wearing them. During the polluted days I definitely wear them. During the spring festival the pollution was really bad. I'm really scared of the pollution." PM2.5 reading - 365 - Hazardous
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