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IQAHealth effectsSecurity notice0 - 50WellAir quality is considered satisfactory and air pollution poses little or no risk.No50 - 100ModerateAir quality is acceptable; However, some pollutants can pose a moderate health risk to a very small number of people who are unusually sensitive to air pollution.Physically active children and adults, and people with respiratory diseases such as asthma, should limit prolonged outdoor exertion.100 - 150Unhealthy for sensitive groupsMembers of sensitive groups can have health effects. The general public is unlikely to be affected.Active children and adults, as well as people with respiratory diseases such as asthma, should limit prolonged outdoor exertion.150 - 200UnhealthyHealth effects can be felt by everyone; sensitive groups may be at serious health risk.Active children and adults, as well as people with respiratory diseases such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion200 - 300Very unhealthyEmergency warning of health hazards. The general population is likely to be affected.Active children and adults, as well as people with respiratory conditions such as asthma, should avoid all outdoor exertion. Everyone else, especially children, should limit their outdoor exertion.300 - 500DangerousHealth Warning: Anyone Can Have More Serious Health EffectsEveryone should avoid any exertion in the open air