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Thirdly, I didn't get the wood-burning thing at all because we don't have fireplaces in south india.

Aren't wood-burning stoves pretty common? Like these,

https://en.wikipedia.org/wiki/Air_pollution_in_India#Fuel_wo...

Exactly what I was going to say. Wood burning stoves are very common especially in villages and also among poor people as wood is more widely available and is cheaper than LPG. We ourself have wood burning stove as an alternate to the LPG stove because cooking in slow fire on a stone or iron vessel is considered to produce tastier and healthier food. I understood that wood smoke was harmful but that it contains carcinogens is new for me.

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