July 27, 2024

AQS Reference Table

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Downoad a csv version: aqi_breakpoints.csv

Parameter	Parameter Code	Duration Code	Duration Description	AQI Category	Low AQI	High AQI	Low Breakpoint	High Breakpoint
Acceptable PM2.5 AQI & Speciation Mass	88502	7	24 HOUR	GOOD	0	50	0.0	9.0
Acceptable PM2.5 AQI & Speciation Mass	88502	7	24 HOUR	MODERATE	51	100	9.1	35.4
Acceptable PM2.5 AQI & Speciation Mass	88502	7	24 HOUR	UNHEALTHY FOR SENSITIVE	101	150	35.5	55.4
Acceptable PM2.5 AQI & Speciation Mass	88502	7	24 HOUR	UNHEALTHY	151	200	55.5	125.4
Acceptable PM2.5 AQI & Speciation Mass	88502	7	24 HOUR	VERY UNHEALTHY	201	300	125.5	225.4
Acceptable PM2.5 AQI & Speciation Mass	88502	7	24 HOUR	HAZARDOUS	301	500	225.5	325.4
Acceptable PM2.5 AQI & Speciation Mass	88502	7	24 HOUR	HAZARDOUS	501	999	325.5	99999.9
Acceptable PM2.5 AQI & Speciation Mass	88502	X	24-HR BLK AVG	GOOD	0	50	0.0	9.0
Acceptable PM2.5 AQI & Speciation Mass	88502	X	24-HR BLK AVG	MODERATE	51	100	9.1	35.4
Acceptable PM2.5 AQI & Speciation Mass	88502	X	24-HR BLK AVG	UNHEALTHY FOR SENSITIVE	101	150	35.5	55.4
Acceptable PM2.5 AQI & Speciation Mass	88502	X	24-HR BLK AVG	UNHEALTHY	151	200	55.5	125.4
Acceptable PM2.5 AQI & Speciation Mass	88502	X	24-HR BLK AVG	VERY UNHEALTHY	201	300	125.5	225.4
Acceptable PM2.5 AQI & Speciation Mass	88502	X	24-HR BLK AVG	HAZARDOUS	301	500	225.5	325.4
Acceptable PM2.5 AQI & Speciation Mass	88502	X	24-HR BLK AVG	HAZARDOUS	501	999	325.5	99999.9
Carbon monoxide	42101	Z	8-HR RUN AVG END HOUR	GOOD	0	50	0.0	4.4
Carbon monoxide	42101	Z	8-HR RUN AVG END HOUR	MODERATE	51	100	4.5	9.4
Carbon monoxide	42101	Z	8-HR RUN AVG END HOUR	UNHEALTHY FOR SENSITIVE	101	150	9.5	12.4
Carbon monoxide	42101	Z	8-HR RUN AVG END HOUR	UNHEALTHY	151	200	12.5	15.4
Carbon monoxide	42101	Z	8-HR RUN AVG END HOUR	VERY UNHEALTHY	201	300	15.5	30.4
Carbon monoxide	42101	Z	8-HR RUN AVG END HOUR	HAZARDOUS	301	500	30.5	50.4
Carbon monoxide	42101	Z	8-HR RUN AVG END HOUR	HAZARDOUS	501	999	50.4	99999.9
Nitrogen dioxide (NO2)	42602	1	1 HOUR	GOOD	0	50	0.0	53.0
Nitrogen dioxide (NO2)	42602	1	1 HOUR	MODERATE	51	100	54.0	100.0
Nitrogen dioxide (NO2)	42602	1	1 HOUR	UNHEALTHY FOR SENSITIVE	101	150	101.0	360.0
Nitrogen dioxide (NO2)	42602	1	1 HOUR	UNHEALTHY	151	200	361.0	649.0
Nitrogen dioxide (NO2)	42602	1	1 HOUR	VERY UNHEALTHY	201	300	650.0	1249.0
Nitrogen dioxide (NO2)	42602	1	1 HOUR	HAZARDOUS	301	500	1250.0	2049.0
Nitrogen dioxide (NO2)	42602	1	1 HOUR	HAZARDOUS	501	999	2050.0	99999.0
Ozone	44201	1	1 HOUR	NONE	-1	-1	0.0	0.124
Ozone	44201	1	1 HOUR	UNHEALTHY FOR SENSITIVE	101	150	0.125	0.164
Ozone	44201	1	1 HOUR	UNHEALTHY	151	200	0.165	0.204
Ozone	44201	1	1 HOUR	VERY UNHEALTHY	201	300	0.205	0.404
Ozone	44201	1	1 HOUR	HAZARDOUS	301	500	0.405	0.604
Ozone	44201	1	1 HOUR	HAZARDOUS	501	999	0.605	99999.9
Ozone	44201	W	8-HR RUN AVG BEGIN HOUR	NONE	-1	-1	0.505	99999.0
Ozone	44201	W	8-HR RUN AVG BEGIN HOUR	GOOD	0	50	0.0	0.054
Ozone	44201	W	8-HR RUN AVG BEGIN HOUR	MODERATE	51	100	0.055	0.07
Ozone	44201	W	8-HR RUN AVG BEGIN HOUR	UNHEALTHY FOR SENSITIVE	101	150	0.071	0.085
Ozone	44201	W	8-HR RUN AVG BEGIN HOUR	UNHEALTHY	151	200	0.086	0.105
Ozone	44201	W	8-HR RUN AVG BEGIN HOUR	VERY UNHEALTHY	201	300	0.106	0.2
PM10 Total 0-10um STP	81102	7	24 HOUR	GOOD	0	50	0.0	54.0
PM10 Total 0-10um STP	81102	7	24 HOUR	MODERATE	51	100	55.0	154.0
PM10 Total 0-10um STP	81102	7	24 HOUR	UNHEALTHY FOR SENSITIVE	101	150	155.0	254.0
PM10 Total 0-10um STP	81102	7	24 HOUR	UNHEALTHY	151	200	255.0	354.0
PM10 Total 0-10um STP	81102	7	24 HOUR	VERY UNHEALTHY	201	300	355.0	424.0
PM10 Total 0-10um STP	81102	7	24 HOUR	HAZARDOUS	301	500	425.0	604.0
PM10 Total 0-10um STP	81102	7	24 HOUR	HAZARDOUS	501	999	605.0	99999.9
PM10 Total 0-10um STP	81102	X	24-HR BLK AVG	GOOD	0	50	0.0	54.0
PM10 Total 0-10um STP	81102	X	24-HR BLK AVG	MODERATE	51	100	55.0	154.0
PM10 Total 0-10um STP	81102	X	24-HR BLK AVG	UNHEALTHY FOR SENSITIVE	101	150	155.0	254.0
PM10 Total 0-10um STP	81102	X	24-HR BLK AVG	UNHEALTHY	151	200	255.0	354.0
PM10 Total 0-10um STP	81102	X	24-HR BLK AVG	VERY UNHEALTHY	201	300	355.0	424.0
PM10 Total 0-10um STP	81102	X	24-HR BLK AVG	HAZARDOUS	301	500	425.0	604.0
PM10 Total 0-10um STP	81102	X	24-HR BLK AVG	HAZARDOUS	501	999	605.0	99999.9
PM2.5 - Local Conditions	88101	7	24 HOUR	GOOD	0	50	0.0	9.0
PM2.5 - Local Conditions	88101	7	24 HOUR	MODERATE	51	100	9.1	35.4
PM2.5 - Local Conditions	88101	7	24 HOUR	UNHEALTHY FOR SENSITIVE	101	150	35.5	55.4
PM2.5 - Local Conditions	88101	7	24 HOUR	UNHEALTHY	151	200	55.5	125.4
PM2.5 - Local Conditions	88101	7	24 HOUR	VERY UNHEALTHY	201	300	125.5	225.4
PM2.5 - Local Conditions	88101	7	24 HOUR	HAZARDOUS	301	500	225.5	325.4
PM2.5 - Local Conditions	88101	7	24 HOUR	HAZARDOUS	501	999	325.5	99999.9
PM2.5 - Local Conditions	88101	X	24-HR BLK AVG	GOOD	0	50	0.0	9.0
PM2.5 - Local Conditions	88101	X	24-HR BLK AVG	MODERATE	51	100	9.1	35.4
PM2.5 - Local Conditions	88101	X	24-HR BLK AVG	UNHEALTHY FOR SENSITIVE	101	150	35.5	55.4
PM2.5 - Local Conditions	88101	X	24-HR BLK AVG	UNHEALTHY	151	200	55.5	125.4
PM2.5 - Local Conditions	88101	X	24-HR BLK AVG	VERY UNHEALTHY	201	300	125.5	225.4
PM2.5 - Local Conditions	88101	X	24-HR BLK AVG	HAZARDOUS	301	500	225.5	325.4
PM2.5 - Local Conditions	88101	X	24-HR BLK AVG	HAZARDOUS	501	999	325.5	99999.9
Sulfur dioxide	42401	1	1 HOUR	GOOD	0	50	0.0	35.0
Sulfur dioxide	42401	1	1 HOUR	MODERATE	51	100	36.0	75.0
Sulfur dioxide	42401	1	1 HOUR	UNHEALTHY FOR SENSITIVE	101	150	76.0	185.0
Sulfur dioxide	42401	1	1 HOUR	UNHEALTHY	151	200	186.0	304.0
Sulfur dioxide	42401	1	1 HOUR	UNHEALTHY	200	200	305.0	99999.0
Sulfur dioxide	42401	X	24-HR BLK AVG	NONE	-1	-1	0.0	304.0
Sulfur dioxide	42401	X	24-HR BLK AVG	VERY UNHEALTHY	201	300	305.0	604.0
Sulfur dioxide	42401	X	24-HR BLK AVG	HAZARDOUS	301	500	605.0	1004.0
Sulfur dioxide	42401	X	24-HR BLK AVG	HAZARDOUS	501	999	1005.0	99999.0