Mexico City is one of the more unusual places that Formula 1 races, and it’s all thanks to altitude. The city sits at than 7,350 feet (2,240 m) above sea level, which makes the air noticeably thin compared to the average Grand Prix held at sea level. Like humans, F1 cars need air.
Oxygen is necessary if you want any internal combustion to happen inside the turbocharged 1.6 L V6 engine. A good flow of air across the various radiators and heat exchangers in the car is vital if you want to make it to the end of the race. And the downforce-generating wings and underbody only generate downforce by creating differences in air pressure above and below the car.
At over a mile above sea level, there’s about 20 percent less air, and therefore less power created by combustion, less efficient cooling of the cars, and less downforce able to be generated.
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Source: Ars Technica
