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Air quality in this range provides the best conditions for exercise and other outdoor activities.

The air quality is acceptable for all people, but some members of sensitive groups may feel little impact on their health if they undertake strong physical outdoors activity.

Air quality is acceptable for most people, although some members of sensitive groups may experience health effects if they exercise or engage in prolonged outdoor activities.

The air quality may affect healthy people if they exercise or undertake a prolonged or strenuous outdoors physical exertion, and this effect increases for members of sensitive groups.

The air quality is unhealthy for all people, especially the sensitive groups if the stay outdoors for long periods.
It’s preferable to minimize outdoor activities.

The air quality has health effects on everyone.
It is recommended to avoid being outdoors for long periods.

The air quality has health effects on everyone.
It is recommended to avoid being outdoors for long periods.