Delhi's air quality dips to 'poor' category

Delhi was listed as India's most polluted city Thursday as a weeks-long air quality crisis gripping northern India has shown ...
Air pollution reached its highest level in five years in Lahore in mid-November before making it’s way back towards Delhi ...
NEW DELHI -- The toxic smog cloaking New Delhi in recent weeks has been smothering its 20 million or so residents with dangerous pollution but breathing life into debate about whether the city can ...