People walk in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

People cool off in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

A boy cools off with an iced drink in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

People cool off in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

An ice-cream car is seen on the street in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Photo by Zhou Huanxin/Xinhua)

People cool off in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

A woman walks through the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

A boy cools off in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

A woman walks her dog in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

People cool off in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

People cool off in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

People cool off in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

People cool off in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)

A girl plays scooter in the mist garden near the Unisphere in Flushing Meadows Corona Park in New York, the United States, Aug. 13, 2021. A heat wave recently hit New York City. (Xinhua/Wang Ying)