Since early November, Delhi and large parts of North India have been enveloped in a thick, grey smog, sparking concerns and a debate on what is leading to the rising levels of air pollution. A January 2012 paper by Ridhima Gupta from the Indian Statistical Institute, Delhi is drawing linkages between the quality of air in the capital and agricultural practices during harvest season on farms in the neighbouring state...

-The Hindustan Times There is a nip in the air even though winter is yet to arrive in full force in Delhi. The Capital, however, is choking with winter smog due to a heavier pollution load. The levels of respirable particulate matter (PM10) have surged 47% and nitrogen dioxide levels have increased 57%. The current levels of fine particulates are four to six times higher than the acceptable limit. Along with...

-The Economist MID-AFTERNOON in Delhi, and a red blob looms in the haze. The sun barely illuminates the city. A yellow-green smog hangs low. Even indoors, fuzzy halos of dust and smoke surround lamps. Those foolish enough to be out jogging, or compelled to stand at junctions directing traffic, complain of shortness of breath, migraines, clogged lungs. Newspapers are crammed with articles about asthma, wheezing children at clinics, an epidemic of...

-Al Jazeera Treaty to ban chemicals that harmed the ozone layer came about when there was consensus between science and politics. In 1974, chemists Mario Molina and Frank Sherwood Rowland published a landmark article that demonstrated the ability of chlorofluorocarbons (CFCs) to break down the ozone layer, the atmospheric region that plays a vital role in shielding humans and other life from harmful ultraviolet (UV) radiation. It marked the opening salvo of...

-Reuters   The world's urban areas will more than double in size by 2030, presenting an opportunity to build greener and healthier cities, a UN study showed on Monday.   Simple planning measures such as more parks, trees or roof gardens could make cities less polluted and help protect plants and animals, especially in emerging nations led by China and India where city growth will be fastest, it said. "Rich biodiversity can exist in cities...