Per­fect recipe for smog

Down to Earth - - COVER STORY -

Smog around Di­wali is a tem­po­rary phe­nom­e­non. But it was not so for Delhi this year. High lev­els of air pol­lu­tion in Delhi and smoke from the burn­ing of agri­cul­tural residue in neigh­bour­ing states dur­ing a time when the weather is wind­less and cool led to the for­ma­tion of a dense smog that held the national cap­i­tal hostage for about 10 days

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