Is it safe to go outside and exercise on ozone action days?
People can safely go outside on ozone action days, but they should avoid vigorous outdoor exercise or labor in the afternoons. Even on Code Orange or Red days, ozone levels generally do not reach unhealthy levels until the afternoons when temperatures are the hottest. Morning is the best time for outdoor activities on high ozone days. At high elevations in the mountains, ozone levels can remain high throughout the day and night during bad air events — so people should limit outdoor activities if they notice signs of adverse ozone reactions, such as coughing and breathing difficulty.
