A practical guide for Chicago athletes training through smoky summer conditions.
Canadian wildfire smoke has once again pushed into the Chicago area, creating hazy skies, reduced visibility, and air quality levels that can make outdoor training risky. For athletes who run along the lakefront, bike city streets and suburban roads, or swim at beaches and outdoor pools, the concern is not just the smell of smoke or an uncomfortable workout. Wildfire smoke contains fine particle pollution that can travel deep into the lungs and may affect breathing, endurance, recovery, and overall health.
During exercise, athletes breathe faster and more deeply. That means a runner completing intervals, a cyclist climbing into a headwind, or a swimmer doing hard repeats may inhale more polluted air than someone walking slowly or resting indoors. When smoke pushes the Air Quality Index into unhealthy ranges, the training benefit of an outdoor workout may be outweighed by the respiratory stress caused by breathing in smoke particles.
Common warning signs include a scratchy throat, burning eyes, coughing, chest tightness, wheezing, unusual fatigue, headache, or feeling winded earlier than normal. Athletes with asthma, allergies, heart or lung conditions, recent illness, or a history of breathing issues should be especially cautious.
Before heading out, check the current AQI and the forecast. Conditions can change quickly by neighborhood, especially near Lake Michigan, where wind shifts may move smoke in or out. If the AQI is elevated, pay attention to how the air looks and smells. If the skyline is hazy, the sun looks muted or orange, or smoke is noticeable, treat the workout as a risk-management decision rather than a normal training day.
A useful rule for training decisions is to reduce one or more of the following: intensity, duration, or exposure. That may mean turning a tempo run into an easy run, shortening a long ride, moving swim practice indoors, or replacing an outdoor workout with strength training, mobility work, or an indoor session.
Running
Running is one of the highest-risk outdoor activities during smoky conditions because it increases breathing rate quickly. On poor-air days, avoid speed workouts, hill repeats, races, and long runs outdoors. If you choose to run, keep it short and conversational, avoid busy roads where smoke combines with vehicle pollution, and stop if breathing feels abnormal.
Biking
Cyclists may spend several hours outside, which increases total exposure even when effort feels moderate. Reduce ride length, avoid hard group rides, and consider using an indoor trainer when air quality is unhealthy. If you must ride for transportation, keep the effort easy, choose lower-traffic routes when possible, and build in recovery time indoors.
Swimming
Outdoor swimmers should remember that smoke exposure still matters at beaches and outdoor pools. Hard swim sets can increase breathing demand, and humid or stagnant conditions may make the air feel heavier. When AQI is high, move swim practice indoors if available, shorten outdoor sessions, and avoid intense intervals. Lake swimmers should also consider visibility, lifeguard guidance, water conditions, and whether beach programs have been modified or canceled.
- Check AQI before every workout. Use current conditions, not just the general forecast, because smoke levels can change throughout the day.
- Avoid hard efforts when AQI is unhealthy. Save intervals, tempo runs, race-pace work, and long endurance sessions for cleaner air.
- Move workouts indoors when needed. A treadmill, bike trainer, indoor pool, strength session, or rest day is often the smarter training choice.
- Shorten and simplify outdoor sessions. If you go outside, reduce duration and intensity so you breathe less deeply.
- Listen to symptoms. Coughing, wheezing, chest tightness, dizziness, unusual fatigue, or shortness of breath are signs to stop and get indoors.
- Protect recovery. Smoke exposure can add stress to the body, so prioritize hydration, sleep, easy movement, and clean indoor air after training.
- Use a well-fitting respirator for necessary outdoor time. A properly fitted N95-style respirator can reduce particle exposure during essential outdoor activity, though it is not ideal for hard training.
- Be flexible with training plans. Missing or modifying one workout is better than forcing a session that may compromise your breathing or recovery.
For current conditions, athletes can check AirNow.gov, the official U.S. Air Quality Index resource from the EPA, or use the AirNow Fire and Smoke Map during wildfire smoke events. Chicago athletes may also consult Open Air Chicago for neighborhood-level air quality sensor information. Because smoke conditions can shift quickly, check AQI shortly before heading out and again if the sky, smell, or wind conditions change.
| AQI Level | Training Recommendation |
| Good to Moderate | Most healthy athletes can usually train normally, but sensitive athletes should monitor symptoms. |
| Unhealthy for Sensitive Groups | Athletes with asthma, allergies, heart or lung conditions, or recent illness should move indoors or reduce intensity. |
| Unhealthy | Everyone should consider moving hard training indoors. If outside, keep activity short and easy. |
| Very Unhealthy or Hazardous | Avoid outdoor workouts. Choose indoor training, recovery work, or rest. |
Chicago athletes are used to training through wind, heat, humidity, and winter weather. Wildfire smoke requires a different mindset. The smartest athletes are not the ones who force every workout outside; they are the ones who adapt. When the air is smoky, protect your lungs, adjust the plan, and remember that long-term consistency matters more than any single run, ride, or swim