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For many, January means joining a gym, stepping up or even starting an exercise regime.

But in India, there's a major barrier to getting fit.

The country's pollution levels are astronomical and could ruin their dreams of hosting the Olympic Games.

And in some of India's most polluted cities, attempting to exercise could in itself be a health hazard, as Rahul Tandon has been finding out.

Photo: People playing cricket amid heavy smog in New Dehli (Getty Images)