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epa09314134 A person cools off under a waterfall at a park during hot, humid weather in Washington, DC, USA, 30 June 2021. As historic heat waves have gripped some parts of the country, the nation's capital is experiencing temperatures in the 90s with a scorching heat index that could reach or pass 100 degrees Fahrenheit (37.7 Celsius), 30 June. EPA/MICHAEL REYNOLDS