Should You Cancel a Utah Outdoor Day Because of Wildfire Smoke?

I would postpone a strenuous Utah outdoor day if the destination’s Air Quality Index (AQI) is red or worse, or spend the day indoors somewhere with cleaner air. At orange, higher-risk travelers should reduce strenuous outdoor activity. The decision depends on the air at your destination, how it may change and who is traveling with you.

When to change the outdoor plan

Orange AQI, 101–150, means unhealthy for sensitive groups. At this level, the Northern Sonoma air district’s AQI activity guide advises sensitive individuals to reduce strenuous outdoor exertion. At red, 151–200, Utah DEQ’s wildfire guidance says everyone should cut back on outdoor activities, and sensitive individuals should avoid prolonged or heavy exertion. For a strenuous day at red or worse, I recommend the more conservative choice of postponing or moving indoors.

The CDC’s wildfire health guidance identifies children, older adults and pregnant people as higher-risk groups, along with people who have asthma, COPD, cardiovascular disease, diabetes or chronic kidney disease. When planning a day together, follow the more cautious activity guidance if anyone in your group falls into one of these categories.

Read the AQI, forecast and smoke map together

Current AQI tells you how unhealthy the air is in your destination area now. During wildfire smoke, it provides a particle-pollution reading that can guide how much time and effort to spend outdoors. The EPA’s AQI activity guidance explains how to adjust activity to the reading. Visibility offers an additional warning: Utah DEQ notes that visibility below five miles during wildfire conditions generally signals air unhealthy for sensitive groups. A view beyond five miles, however, is not enough to judge the air healthy. Use the AQI rather than the clarity of the scenery to assess health risk.

The forecast can help you decide whether to go later or reschedule for another day. Utah DAQ provides hourly PM2.5 and ozone updates and three-day health forecasts on its website and in the UtahAir app. These are health forecasts, not a smoke-specific model, and conditions when you arrive may differ from the forecast.

AirNow’s Utah page and its Fire and Smoke Map show current air-quality readings alongside smoke and fire information. The map combines monitoring stations, calibrated low-cost sensors and satellite smoke plumes. Use the local NowCast AQI to assess current air quality, and the plume imagery to see where satellite observations show smoke. The imagery does not measure ground-level exposure, and NowCast does not forecast conditions for the rest of your day.

Before leaving, check the current AQI and official forecast for your destination, not just your starting point. If the forecast suggests a better opportunity later, check current conditions again before heading out. Reassess if conditions change during the day rather than relying on the morning reading. September and October trips need the same destination-specific checks.

Shorten the outing, move indoors or postpone

If local air quality and your group’s health risks allow outdoor activity, reduce both the time outside and the effort. The EPA recommends shorter activity, frequent rests and replacing high-aerobic exercise with low-intensity walking. A brief, easy walk fits that advice. Rushing through the same demanding hike to finish sooner does not.

When outdoor air is unhealthy, postponing or spending time indoors somewhere with cleaner air is the more cautious choice. Even a short hike exposes you to the outdoor air. Indoor venues also vary in air quality, so the alternative needs to offer cleaner air, not just shelter.