HiAir for runners

Find the better outdoor training window

Use hourly environmental context to decide whether to train now, go later, reduce intensity or choose an indoor session.

Hourly windows

Compare likely conditions across the hours available for your training.

Combined context

Review heat, humidity and air-quality signals in the same decision.

Explainable guidance

Understand why a window is preferred and where forecast data is unavailable.

Before you head out

Check the current local alert, the hourly trend and how you feel. Hot-weather exercise increases the risk of dehydration and heat-related illness. If you feel faint or weak, stop activity and move to a cool place.

Use the hot-weather exercise guide for a step-by-step pre-workout check that includes AQI, not only temperature.

Reference: CDC — Heat and Athletes.

Personalize the next step

Turn environmental data into a plan for your day

Download HiAir on the App Store. Android is not publicly listed yet — use the Android notify form on the homepage if you want an email when it opens.

Download on the App Store

Last reviewed 2026-08-29. Wellness guidance only — not medical advice.