Clever tricks for cleaner bricks – 1 June 2012, The Economist

OUTSIDE a village called Mau, in Uttar Pradesh, half a dozen chimneys rise from kilns into a colourless sky. These ovens, six among the 100,000 which turn out the 200 billion bricks made each year in India, are worked by dalits—members of castes once regarded as untouchable. India’s brick kilns are noxious sources of pollution, particularly soot, and working them means a life that is always nasty, frequently brutish and often short. But on top of this social evil is an environmental one. The exhaust from the kilns mixes with diesel.