Table 5.

Air quality index and recommendations

AQI level	AQI value	PM2.5	PM10	Actions to protect your health from particle pollution
Good	0–50	0–15	0–50	None
Moderate	51–100	16–35	51–154	Unusually sensitive people should consider reducing prolonged or heavy exertion
Unhealthy for sensitive groups	101–150	36–65	155–254	Susceptible groupsa should reduce prolonged or heavy exertion
				Everyone else should limit prolonged or heavy exertion
Unhealthy for sensitive groups	151–200	66–150	255–354	Susceptible groupsa should avoid all physical activity outdoors
				Everyone else should avoid prolonged or heavy exertion
Very unhealthy	201–300	>150	>354	Susceptible groupsa should remain indoors and keep activity levels low
				Everyone else should avoid all physical activity outdoors

EPA-456/F-09-002

Air quality index: a guide to air quality and your health. EPA, August 2009

AQI air quality index

^aPeople with heart or lung disease, children, or older adults