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GoodGreenAir quality is considered satisfactory, and air pollution poses little or no risk.NoneNoneGoodGoodhttp://www.fnsb.us/transportation/AQIImages/AQIgood.gif, Goodhttp://dweb.public.fnsb.us/transportation/AQIImages/smgood.png,Good1
  
ModerateYellowAir quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.Unusually sensitive people should consider reducing prolonged or heavy exertion.NoneModerateModeratehttp://www.fnsb.us/transportation/AQIImages/AQImoderate.gif, Moderatehttp://dweb.public.fnsb.us/transportation/AQIImages/smmod.png,Moderate2
  
Unhealthy for Sensitive GroupsOrangeMembers of sensitive groups may experience health effects. The general public is not likely to be affected.People with respiratory or heart disease, the elderly, and children should limit prolonged exertion.Increasing likelihood of respiratory symptoms in sensitive individuals, aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly.Unhealthy for Sensitive GroupsUnhealthy for Sensitive Groupshttp://www.fnsb.us/transportation/AQIImages/AQIusg.gif, Unhealthy for Sensitive Groupshttp://dweb.public.fnsb.us/transportation/AQIImages/smusg.png,Unhealthy for Sensitive Groups3
  
Unhealthy RedEveryone may begin to experience health effects; members of sensitive groups may experience more serious health effects.People with respiratory or heart disease, the elderly, and children should avoid prolonged exertion; everyone else should limit prolonged exertion.Increased aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly: increased respiratory effects in general population.UnhealthyUnhealthyhttp://www.fnsb.us/transportation/AQIImages/AQIunhealthy.gif, Unhealthyhttp://dweb.public.fnsb.us/transportation/AQIImages/smU.png,Unhealthy4
  
Very UnhealthyPurpleHealth warnings of emergency conditions. The entire population is more likely to be affected.People with respiratory or heart disease, the elderly, and children should avoid outdoor activity; everyone else should avoid prolonged exertion.Significant aggravation of the heart of lung disease and premature mortality in persons with cardiopulmonary disease and the elderly: significant increase in respiratory effects in the general population.Very UnhealthyVery Unhealthyhttp://www.fnsb.us/transportation/AQIImages/AQIveryunhealthy.gif, Very Unhealthyhttp://dweb.public.fnsb.us/transportation/AQIImages/smvu.png,Very Unhealthy5
  
HazardousMaroonHealth alert: everyone may experience more serious health effectsEveryone should avoid any outdoor exertion; people with respiratory or heart disease; the elderly and children should remain indoors.Significant aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly: significant increase in respiratory effects in the general population.HazardousHazardoushttp://www.fnsb.us/transportation/AQIImages/AQIhazardous.gif, Hazardoushttp://dweb.public.fnsb.us/transportation/AQIImages/smh.png,Hazardous6