U.S. Soccer Air Quality Index Guidelines
If clubs/teams are aware of a potential air quality issue in their home market in advance of hosting a match, they must notify the league as soon as they become aware of the issue. Teams/Clubs can use www.airnow.gov to determine air quality index (AQI) in the local market. AQI is to be read 1 hour prior to teams starting warmups. The table below shows the levels of concern, values of air quality index, and description of air quality:
Based on the reading the following should be considered:
If you want to get more information, go to: https://www.airnow.gov/publications/air-quality-index/air-quality-index-a-guide-to-air-quality-and-your-health/
At all times adhere to and collaborate with local and state public health department guidelines.
References
United States Environmental Protection Agency. (2014). Air Quality Index – A guide to air quality and your health. https://www.airnow.gov/publications/air-quality-index/air-quality-index-a-guide-to-air-quality-and-your-health/