An intense heat wave is about to hit the central and eastern United States, putting millions of Americans to the test. Temperatures could reach historic levels, with potentially

A potentially life-threatening heat wave enveloped the eastern third of the United States on Monday (Jun 23) impacting nearly 160 million people, with temperatures this week expected to reach 39 degrees Celsius in the New York metropolitan area.

Boston carpenter says the humidity is the worst as triple digit heat hits the East coast. (AP Video: Rodrique Ngowi)

Heat waves are primarily caused by high-pressure systems that push warm air down onto an area and hold it there. During heat waves, the air is stagnant, with little wind to blow away pollutant emissions from sources like vehicles or buildings. Sunny, hot conditions also encourage ozone to form faster. As a heat wave continues, pollution builds up.

Heat doesn’t just mean canceled events. It also poses a health risk. If you can’t afford to cool the whole house, make a “cool space” to sleep in. Because experts say the best defense