AQI color scale from Good (green, 0-50) through Moderate (yellow, 51-100), Unhealthy for Sensitive Groups (orange, 101-150), Unhealthy (red, 151-200), Very Unhealthy (purple, 201-300), and Hazardous (maroon, 301-500). Gray indicates no data.GoodModerateUSGUnhealthyV. UnhealthyHazardousNo Data