Mrs. Huang (40), a life long Beijing resident. "About 4-5 years ago I started using masks. I don't feel comfortable in my lungs.", she explains. "Of course there's been a big change in the air. Since the 1980's there were sandstorms. Then it got better. Around 2000, industry got more and more and the air got bad." PM2.5 reading - 188 - Unhealthy
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