The effects of ambient air pollution exposure on Thoroughbred racehorse performance.

Background: Limited research exists on impacts of air pollution on non-human mammals, particularly animal athletes such as Thoroughbred racehorses. Athletes have a greater risk of exposure as heightened exertion and increased airflow carry more pollutants deeper into the respiratory tract.

Objectives: To provide insights into the impact of ambient air pollution, particularly fine particulate matter (PM), on race speed.