How a change in rice farming unexpectedly made India's air so much worse
Briefly

"The agricultural mandate, first adopted in 2008, has caused up to a 20 percent increase in smoke particles in northern Indian cities, including Delhi, according to a team of researchers from the United States, India and elsewhere."
"The growing season for rice has shifted, and you would think that would be fine," said Loretta Mickley, an atmospheric chemist at Harvard University. "The average person will say: What does groundwater have to do with air pollution in Delhi?"
Read at Washington Post
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