Thursday, September 17, 2015

Before-and-after photos of China's air show just how terrible its air pollution is





To get ready for the big parade, Chinese officials reduced the operations at thousands of factories and construction sites — even shutting some down — in Beijing and its surrounding provinces a couple of weeks in advance.... in just one day, the sky made a drastic change back to its gray hue. On September 3, the air quality was at a healthy level of 17 on the air quality index (a measure of how many harmful pollutants, including PM 2.5 are in the air). One day later it jumped up to 158, which is considered an unhealthy level of air pollutants.
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