Indian agriculture, air pollution, and public health in the age of COVID.

World Dev · 2020 · PMC7332940 · PMID 32834377

Europe PMC DOI

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highly significantno p-value reported

Poor air quality already imposes a highly significant public health burden in Northwest India, with pollution levels spiking to hazardous levels in November and early December when rice crop residues are burned.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.