At least half the cities bidding for the 2036 Summer Olympics could experience unsafe temperatures

Three countries — India, Indonesia and Qatar — in Asia and the Middle East want to host the 2036 Olympics, but their average temperatures in summer could exceed safe limits. Chile, where the Southern Hemisphere seasons are reversed, has the most optimal conditions, followed by Poland.

Average wet-bulb globe temperature, 2040–2059 (°F)

Note: Wet-bulb globe temperature (WBGT) is a measurement that combines heat, humidity, windspeed, sun angle and cloud cover. It is a more a nuanced metric for setting exertional heat stress thresholds. The American College of Sports Medicine has set over 82°F WBGT as the threshold to cancel continuous physical activity
* Indonesia's host city will likely be Nusantara — a new capital city currently under construction — which is not included in the source data. The nearest city, Balikpapan, has been used in its place.

Source: CarbonPlan, American College of Sports Medicine, GamesBids, Inside The Games, Polish Olympic Committee

Graphic: Lou Robinson, CNN