Teal: 0-50 AQI (0 to 12 ug / m3) - Air quality is considered satisfactory, and air pollution poses little or no risk = <1 cigarette a day
Yellow: 51-100 AQI (12 to 35 ug / m3) - Air 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 = 5 cigarettes a day
Orange: 101-150 AQI (35 to 55 ug / m3) - Members of sensitive groups may experience health effects. The general public is not likely to be affected = 10 cigarettes a day
Red: 151-200 AQI (55 to 150 ug / m3) - Everyone may begin to experience health effects; members of sensitive groups may expereince more serious health effects = 15 cigarettes a day
Pink: 201-300 AQI (150 to 250 ug / m3) - Health warnings of emergency conditions. The entire population is more likely to be affected = 20 cigarettes a day
Purple: 300+ AQI (250 to 1000 ug / m3) - Health alert: everyone may experience more serious health effects = 25 cigarettes a day