Are Japanese Pitta Masks effective for use in China?

It’s allergy season again. Spring is here, and the catkin white fluff is in the air!     Lately, I’ve noticed many people wearing these Pitta masks out on the streets of Beijing.     They look sleek, but I wondered whether they actually work. After all, data shows that Japan’s air quality is much better than China’s, so it’s possible that they were designed for things other than […]

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Hong Kong’s air quality might not be as good as you think

Hong Kong doesn’t come to mind when people think of air pollution. However, the data tells a different story–one that has important implications for Hong Kongers’ health. Hong Kong’s Air Pollution in Numbers I just analyzed data on Hong Kong’s pollution data and found that PM2.5 averaged 30 micrograms in 2018. Here’s how that compares to […]

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How long do air pollution masks last and when should I change them?

There’s good data showing that masks (including surgical masks) really can stop pollution and even have demonstrated physiological benefits. Masks work. But one place data is lacking is for air pollution mask lifespan. Just how long do air pollution masks really last?   Really Just One Day?   I frequently run into people who suspect that […]

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