Environmental Resources Management Division

City of Indianapolis
Department of Public Works

AQI Breakpoints
Category	Value	Ozone(ppm), 8/hr	Carbon Monoxide (ppm), 8/hr	Sulfur Dioxide (ppm), 24/hr	Fine Particles, (µg/m3), 24/hr
Good	0–50	0.000–0.059	0.0–4.4	0.000–0.034	0.0–15.4
Moderate	51–100	0.060–0.075	4.5–9.4	0.035–0.144	15.5–40.4
Unhealthy for Sensitive Groups	101–150	0.076–0.095	9.5–12.4	0.145–0.224	40.5-65.4
Unhealthy	151–200	0.096–0.115	12.5–15.4	0.225–0.304	65.5–150.4
Very Unhealthy	201–300	0.116–0.374	15.5–30.4	0.305–0.604	150.5–250.4