Linsey Marr of Virginia Tech evaluated marathon race results, weather data and air pollution concentrations for seven major U.S. marathons in cities such as New York, Boston and Los Angeles, where pollution tends to be highest
Multiple runnings of each marathon were evaluated, from eight to 28 consecutive years, depending on the race.
The top three male and female finishing times were compared with the course record and contrasted with air pollutant levels, taking high temperatures (which can negatively impact running performance) into consideration.
Higher levels of particles in the air - also known as smog - were associated with slower performance times for women. Men, however, showed no significant impact from pollution."
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