A red alert should go into effect if there is a prediction that the air quality index will stay above 200 for more than 72 hours. The United States government rates above 200 as “very unhealthy,” and 301 to 500 as “hazardous.” At 7 p.m. Monday, the Beijing municipal reading was 253. [...]
At international climate change talks, including the ones now underway in Paris, Chinese officials have promised to curb coal use in order to address both air pollution and carbon dioxide emissions.
— nytimes.com
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