environment

LONDON (Reuters) - Wood and dung burned for home heating and cooking makes up most of a huge brown cloud of pollution that hangs over South Asia and the Indian Ocean during the winter months, researchers said on Thursday.
The study in the journal Science* solves the mystery of what makes up the soot in the brown haze linked to hundreds of thousands of deaths -- mainly from lung and heart disease -- each year in the region, they said.
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(Editing by Katie Nguyen)