India should walk out of the Doha negotiations if equity is not made a part of the deal, says Sunita Narain in Doha

• The Supreme Court has acknowledged that dieselisation of cars needs to be addressed with effective tax measures

• Delhi is used to winter smogs. But this year’s haze has been particularly severe because pollution levels in the city have gone up manifold – PM10 has increased by 47 per cent between 2000 and 2011, while nitrogen dioxide has gone up by 57 per cent

Laboratory study tests soil, water, fish and human blood, nails and hair.