Pollutant Standards

March 29, 2024

AQS Reference Table

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Parameter Code Parameter Pollutant Standard ID Pollutant Standard Short Name Pollutant Standard Description NAAQS Basis NAAQS Statistic Primary Standard Level Standard Units Comparison Scale Round or Truncate Excludable
42101 Carbon monoxide 3 CO 1-hour 1971 Carbon Monoxide 1-hour standard from 1971. Obseved hourly values Annual Second Maximum 35.0 Parts per million 0 R
42101 Carbon monoxide 4 CO 8-hour 1971 Carbon Monoxide 8-hour running average from 1971. 8-Hour running average (end hour) of observed hourly values Annual Second Non-Overlapping Maximum 9.0 Parts per million 0 R
14129 Lead (TSP) LC 2 Lead 3-Month 2009 Lead 3 month rolling average site level summary based on TSP lead at local conditions. Observed Values 3-Month Rolling Average 0.15 Micrograms/cubic meter (LC) 2 R
12128 Lead (TSP) STP 1 Lead Quarterly 1978 Original lead standard based on calendar quarterly average. Observed Values Quarterly Mean 1.5 Micrograms/cubic meter (25 C) 1 R
85129 Lead PM10 LC FRM/FEM 14 Lead 3-Month PM10 Surrogate 2009 PM10 Surgate (instead of TSP) for the new lead 3 month rolling average site level summary. Observed Values 3-Month Roling Average 0.15 Micrograms/cubic meter (LC) 2 R
42602 Nitrogen dioxide (NO2) 8 NO2 Annual 1971 Nitrogen Dioxide Annual Mean from 1971. Observed values Annual Mean 53.0 Parts per billion 0 R
42602 Nitrogen dioxide (NO2) 20 NO2 1-hour 2010 Nitrogen Dioxide 1-hour standard Daily Maximum 1-hour average Annual 98th Percentile 100.0 Parts per billion 0 R
44201 Ozone 9 Ozone 1-hour 1979 Ozone 1-hour Daily Maximum value based on data completeness betweeen 9 AM and 9 pm. Daily maxima of observed hourly values (between 9:00 AM and 8:00 PM) Annual Estimated Days > Standard 0.12 Parts per million 2 R
44201 Ozone 10 Ozone 8-Hour 1997 Ozone 8-hour running average stored in begin hour from 1997. Daily maximum of 8 hour running average of observed hourly values Annual 4th Maximum 0.08 Parts per million 2 R
44201 Ozone 11 Ozone 8-Hour 2008 Ozone 8-hour running average stored in begin hour from 2008. Daily maximum of 8 hour running average of observed hourly values Annual 4th Maximum 0.075 Parts per million 3 T
44201 Ozone 23 Ozone 8-hour 2015 Ozone 8-hour 2015 -- Daily 8-hour maximum between 7:00 AM and 11:00 PM Daily maximum of 8-hour running average Annual 4th Maximum 0.07 Parts per million 3 T
81102 PM10 Total 0-10um STP 12 PM10 24-hour 2006 PM10 24-hour standard. Violations include actual exceedences and expected exceedences where data is missing. Daily Mean Annual Estimated Days > Standard 150.0 Micrograms/cubic meter (25 C) -1 R
88101 PM2.5 - Local Conditions 25 PM25 Annual 1997 PM25 Annual standard for 1997. Created for Region 9 / AQAD Quarterly Means of Daily Means Annual Weighted Mean 15.0 Micrograms/cubic meter (LC) 1 R Y
88101 PM2.5 - Local Conditions 24 PM25 24-hour 1997 PM25 24-hour standard for 1997. Created for Region 9 / AQAD Daily Mean Annual 98th Percentile 65.0 Micrograms/cubic meter (LC) 0 R
88101 PM2.5 - Local Conditions 18 PM25 Annual 2006 PM25 annual weighted mean was reaffirmed in 2006 with the same level as originally promulgated. Quarterly Means of Daily Means Annual Weighted Mean 15.0 Micrograms/cubic meter (LC) 1 R Y
88101 PM2.5 - Local Conditions 16 PM25 24-hour 2006 PM25 24-hour standard made more restrictive in 2006. Daily Mean Annual 98th Percentile 35.0 Micrograms/cubic meter (LC) 0 R
88101 PM2.5 - Local Conditions 21 PM25 24-hour 2012 PM25 24-hour standard was reaffirmed in 2013 with the same level as previously promulgated. Daily Mean Annual 98th Percentile 35.0 Micrograms/cubic meter (LC) 0 R
88101 PM2.5 - Local Conditions 22 PM25 Annual 2012 PM25 annual standard was lowered in 2013 to increase protection against health effects with long-term exposures. Quarterly Means of Daily Means Annual Weighted Mean 12.0 Micrograms/cubic meter (LC) 1 R Y
42401 Sulfur dioxide 6 SO2 24-hour 1971 Sulfur Dioxide 24-hour standard from 1971. Daily Average of observed values Annual Second Maximum 140.0 Parts per billion 0 R
42401 Sulfur dioxide 5 SO2 3-hour 1971 Sulfur Dioxide 3-hour Block Average from 1971. 3-Hour block average of observed hourly values Annual Second Maximum Parts per billion 0 R
42401 Sulfur dioxide 7 SO2 Annual 1971 Sulfur Dioxide Annual Mean Standard from 1971. Observed Values Annual Mean 30.0 Parts per billion 0 R
42401 Sulfur dioxide 19 SO2 1-hour 2010 Sulphur Dioxide 1-hour standard from 2010 Daily maximum 1-hour average Annual 99th Percentile 75.0 Parts per billion 0 R