Extreme heat in India has killed at least 77 people over the past 10 days, including dozens of poll workers, as voting wrapped up in the world’s largest general election.

At least 33 poll workers died in a single day in India’s most populous state of Uttar Pradesh, the state’s chief election officer, Navdeep Rinwa, told reporters Sunday. Their families will receive $18,000 each in compensation, he said.

The country often experiences heat waves during the summer months of May and June, but in recent years they have arrived earlier and become more prolonged. Experts say the climate crisis is only going to cause more frequent and longer heat waves in the future, testing India’s ability to adapt.

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