Song (33) wearing advanced 'NeoMask', in Beijing's central business district. "I use this for sports. I ran the Beijing marathon last year. That day was really bad so a lot of people quit. I kept going. After that, my mask was completely black. I don't smoke [but] after 20 minutes outside, I can really feel it. It's important I protect myself." PM2.5 reading - 196 - Unhealthy
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