Smartwatches are part of solution to deal with heat

It's a little past IO am and the heat is already blazing on the outskirts of the Western Indian city of Ahmedabad.

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Sapnaben Chunara, a 30-year-old mother of three, has just finished her morning chores. She seeks respite from the heat in the shade of a neem tree, a species that can withstand high temperatures and drought.

Chunara spends most of the day outdoors in Vanzara Vas, a low-income neighbourhood of about 800 families, because her tin-roofed house is even hotter. Indoor temperatures can be even higher, especially when outside they climb above 40 degrees Celsius (104 F).

That was once rare but now happens regularly.

And this year, high heat started three weeks earlier than in previous years, touching 43 degrees Celsius (109.40 F) in early April.