How to Navigate this Air Quality Map

1. Select a Sensor
Each dot represents an active MKE FreshAir air-quality sensor. Click any sensor to open a small information window. The pop-up will show current particulate matter levels (PM2.5) and an associated Air Quality Index (AQI) value.

2. Interpret the Air Quality Index (AQI)
Colors on the map reflect air-quality categories based on U.S. EPA standards:

• Green (Good): Air quality is good, and there are no expected health risks. It’s a great time to enjoy outdoor activities.

• Yellow (Moderate):Air quality is acceptable for most people. However, sensitive individuals, such as those with pre-existing respiratory conditions, may experience mild symptoms like coughing or shortness of breath

• Orange (Unhealthy for Sensitive Groups): Sensitive individuals should avoid outdoor activities and consider wearing an air pollution mask outdoors if necessary.

• Red (Unhealthy for everyone): Everyone, particularly sensitive groups, should avoid all outdoor activities. 

• Purple (Very Unhealthy): Health alerts apply to everyone, with a greater risk of serious health effects for the entire population.

• Maroon (Hazardous): Avoid all outdoor physical activity and stay indoors.