iOS 15 Weather Air Quality Map Color Updates

Apple’s iOS 15 introduced a major redesign to the native Weather app, replacing static information with dynamic, full-screen interactive weather maps. A key enhancement in this update was the overhaul of the air quality map and its accompanying color scales, which transitioned to standardized, regionally adapted health gradients that provide clearer, real-time insights into environmental conditions.

Standardized Six-Tier Color Gradient

In iOS 15, the Weather app adopted an intuitive, multi-tier color spectrum aligned with modern environmental agency standards, such as the United States Environmental Protection Agency (EPA) Air Quality Index (AQI):

  • Green: Indicates "Good" air quality with little to no health risk.
  • Yellow: Represents "Moderate" air quality, acceptable for most but posing a mild risk to highly sensitive individuals.
  • Orange: Signifies "Unhealthy for Sensitive Groups," alerting users with respiratory or cardiovascular issues.
  • Red: Marks "Unhealthy" conditions where the general public may begin to experience health effects.
  • Purple: Indicates "Very Unhealthy" air, triggering increased health warnings.
  • Maroon: Represents "Hazardous" conditions, indicating emergency-level health alerts for all residents.

Regional Scale Localization

Prior versions often applied a generic or less contextual visualization to global data. In iOS 15, the color scale dynamically adapts to the official air quality index of the user's specific region. Rather than forcing a singular US-centric AQI metric globally, the app adjusts the color thresholds to match local standards, such as the European Air Quality Index, China's MEP scale, or the UK's Daily Air Quality Index.

Integrated Visual Legend and Continuous Heatmaps

The map interface in iOS 15 incorporates a persistent gradient bar that acts as a visual legend. When viewing the air quality map layer, users see a color bar illustrating the spectrum from lowest to highest pollution levels. The map itself renders these colors as a continuous, smooth heatmap overlay, allowing users to see the movement and concentration of particulate matter across geographic areas rather than isolated, discrete blocks.

Improved Contrast for Accessibility

The color palette was refined with higher contrast ratios to improve legibility. The distinct separation between the orange, red, and purple tiers makes it easier to quickly evaluate severe pollution levels at a glance, improving readability under bright daylight and supporting system-level accessibility settings.