Our partner site, https://airdensityonline.com, is adding Indy Car Racing racetracks to the air density weather data listings.
Example: Indy Car Racing Firestone Grand Prix, Streets of St. Petersburg, Tampa Bay, FL, Mar 13-15, 2020
current air density, density altitude, water grains, TRACK MAP: https://airdensityonline.com/track-results/Firestone_Grand_Prix/
air density forecast: https://airdensityonline.com/track-forecast/Firestone_Grand_Prix/
historical air density data (change date to go back several years): https://airdensityonline.com/track-history/Firestone_Grand_Prix/2020-03-11/
metric air density data: https://airdensityonline.com/track-results-metric/Firestone_Grand_Prix/