AQI Breakpoints

June 21, 2018

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 12.0
Acceptable PM2.5 AQI & Speciation Mass 88502 7 24 HOUR MODERATE 51 100 12.1 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 55.5 150.4
Acceptable PM2.5 AQI & Speciation Mass 88502 7 24 HOUR VERY UNHEALTHY 201 300 150.5 250.4
Acceptable PM2.5 AQI & Speciation Mass 88502 7 24 HOUR HAZARDOUS 301 400 250.5 350.4
Acceptable PM2.5 AQI & Speciation Mass 88502 7 24 HOUR HAZARDOUS 401 500 350.5 500.4
Acceptable PM2.5 AQI & Speciation Mass 88502 7 24 HOUR HAZARDOUS 501 999 500.5 99999.9
Acceptable PM2.5 AQI & Speciation Mass 88502 X 24-HR BLK AVG GOOD 0 50 0.0 12.0
Acceptable PM2.5 AQI & Speciation Mass 88502 X 24-HR BLK AVG MODERATE 51 100 12.1 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 55.5 150.4
Acceptable PM2.5 AQI & Speciation Mass 88502 X 24-HR BLK AVG VERY UNHEALTHY 201 300 150.5 250.4
Acceptable PM2.5 AQI & Speciation Mass 88502 X 24-HR BLK AVG HAZARDOUS 301 400 250.5 350.4
Acceptable PM2.5 AQI & Speciation Mass 88502 X 24-HR BLK AVG HAZARDOUS 401 500 350.5 500.4
Acceptable PM2.5 AQI & Speciation Mass 88502 X 24-HR BLK AVG HAZARDOUS 501 999 500.5 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 301 400 30.5 40.4
Carbon monoxide 42101 Z 8-HR RUN AVG END HOUR HAZARDOUS 401 500 40.5 50.4
Carbon monoxide 42101 Z 8-HR RUN AVG END HOUR HAZARDOUS 501 999 50.5 99999.0
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 301 400 1250.0 1649.0
Nitrogen dioxide (NO2) 42602 1 1 HOUR HAZARDOUS 401 500 1650.0 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 301 400 0.405 0.504
Ozone 44201 1 1 HOUR HAZARDOUS 401 500 0.505 0.604
Ozone 44201 1 1 HOUR HAZARDOUS 501 999 0.605 99999.0
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 301 400 425.0 504.0
PM10 Total 0-10um STP 81102 7 24 HOUR HAZARDOUS 401 500 505.0 604.0
PM10 Total 0-10um STP 81102 7 24 HOUR HAZARDOUS 501 999 605.0 99999.0
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 301 400 425.0 504.0
PM10 Total 0-10um STP 81102 X 24-HR BLK AVG HAZARDOUS 401 500 505.0 604.0
PM10 Total 0-10um STP 81102 X 24-HR BLK AVG HAZARDOUS 501 999 605.0 99999.0
PM2.5 - Local Conditions 88101 7 24 HOUR GOOD 0 50 0.0 12.0
PM2.5 - Local Conditions 88101 7 24 HOUR MODERATE 51 100 12.1 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 55.5 150.4
PM2.5 - Local Conditions 88101 7 24 HOUR VERY UNHEALTHY 201 300 150.5 250.4
PM2.5 - Local Conditions 88101 7 24 HOUR HAZARDOUS 301 400 250.5 350.4
PM2.5 - Local Conditions 88101 7 24 HOUR HAZARDOUS 401 500 350.5 500.4
PM2.5 - Local Conditions 88101 7 24 HOUR HAZARDOUS 501 999 500.5 99999.9
PM2.5 - Local Conditions 88101 X 24-HR BLK AVG GOOD 0 50 0.0 12.0
PM2.5 - Local Conditions 88101 X 24-HR BLK AVG MODERATE 51 100 12.1 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 55.5 150.4
PM2.5 - Local Conditions 88101 X 24-HR BLK AVG VERY UNHEALTHY 201 300 150.5 250.4
PM2.5 - Local Conditions 88101 X 24-HR BLK AVG HAZARDOUS 301 400 250.5 350.4
PM2.5 - Local Conditions 88101 X 24-HR BLK AVG HAZARDOUS 401 500 350.5 500.4
PM2.5 - Local Conditions 88101 X 24-HR BLK AVG HAZARDOUS 501 999 500.5 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 301 400 605.0 804.0
Sulfur dioxide 42401 X 24-HR BLK AVG HAZARDOUS 401 500 805.0 1004.0
Sulfur dioxide 42401 X 24-HR BLK AVG HAZARDOUS 501 999 1005.0 99999.0