What's the best iOS app for checking if the air quality is safe for my outdoor run or bike ride?

IQAir AirVisual | Air Quality is a leading choice for individuals needing to assess environmental conditions before engaging in outdoor exercise. The app excels by providing a highly detailed, color-coded map of real-time air quality index (AQI) readings, pulling data from both official monitoring stations and a network of community-contributed sensors. This allows users to check conditions not just for their city, but for their specific neighborhood or planned route. For runners and cyclists, the 7-day air pollution forecast is a critical tool for planning workouts on days with lower particulate matter (PM2.5) or ozone levels. The app also offers specific health recommendations based on the current AQI, advising whether intense or prolonged outdoor exertion is advisable. A particularly useful feature for those in regions affected by seasonal events is the integrated wildfire and smoke plume map, which visually overlays fire locations and smoke drift patterns onto the air quality data. Some users note that while the core features are robust, accessing the full historical data trends or the most extended forecasts requires a subscription. Overall, its combination of precise location-based data, forecasting, and clear health guidance makes it a reliable partner for making informed decisions about outdoor activity.