Air Trends
Design Values
A design value is a statistic that describes the air quality status of a given location relative to the level of the National Ambient Air Quality Standards (NAAQS).
- Design values are defined to be consistent with the individual NAAQS as described in CFR Part 50.
- Design values are typically used to designate and classify nonattainment areas, as well as to assess progress towards meeting the NAAQS.
- Design values are computed and published annually by EPA's Office of Air Quality Planning and Standards and reviewed in conjunction with the EPA Regional Offices. Some of these design values can change after the date of publication for a variety of reasons, including but not limited to: 1) EPA agreement that certain data were influenced by exceptional events and therefore not subject for comparison with the NAAQS, 2) States retroactively entering or changing erroneous data based on later findings, and/or 3) notification of a monitoring issue (e.g. network design, site combination, change in the regulatory status of a monitor) that would prompt a revision.
- When design values are used in a regulatory action, they are based on the latest information and valid data available at the time of that action, not the values published here.
Design Value period ending: |
Design Value Reports |
|---|---|
2011 |
PM2.5 Detailed Information (XLSX, 1.65MB) - Annual design values in this file are calculated for the 1997 annual PM2.5 NAAQS (15.0 ug/m3) and may not be appropriate to compare to the revised annual standard of 12.0 ug/m3. Please refer to the data files of annual design values calculated for the revised annual PM2.5 standard (PDF) (13pp, 64k) PM10 Detailed Information (XLSX, 1.4MB) Ozone Detailed Information (XLSX, 558k) - Updated on August 7, 2012 (Clarification on data handling) Carbon Monoxide Detailed Information (XLSX, 267k) Sulfur Dioxide Detailed Information (XLSX, 503k) Nitrogen Dioxide Detailed Information (XLSX, 274k) Lead Detailed Information (XLSX, 365k) |
2010 |
PM2.5 Detailed Information (XLSX, 1.59 MB) PM10 Detailed Information (XLSX, 196k) Ozone Detailed Information (XLSX, 550k) Carbon Monoxide Detailed Information (XLSX, 89k) Sulfur Dioxide Detailed Information (XLSX, 169k) Nitrogen Dioxide Detailed Information (XLSX, 90k) Lead Detailed Information (XLSX, 138k) |
2009 |
PM2.5 Summary (PDF, 78k) Detailed Information (XLS, 2.4 MB) PM10 Summary (PDF, 87k) Detailed Information (XLS, 502k) Ozone Summary (PDF, 130k) Detailed Information (XLS, 849k) Carbon Monoxide Summary (PDF, 32k) Detailed Information (XLS, 239k) Sulfur Dioxide Summary (PDF, 29k) Detailed Information (XLS, 320k) Nitrogen Dioxide Summary (PDF, 23k) Detailed Information (XLS, 170k) Lead Design Values Summary (PDF, 72k) Detailed Information (XLS, 267k) |
2008 |
PM2.5 Summary (PDF, 155k) Detailed Information (XLS, 12.9 MB) Changes to the treatment of PM2.5 data affected by exceptional events since the preparation of the two files posted here may mean that some PM2.5 design values in these files are no longer correct. PM10 Summary (PDF, 212k) Detailed Information (XLS, 478k) Ozone Summary (PDF, 176k) Detailed Information (XLS, 1.0 MB) Carbon Monoxide Summary (PDF, 92k) Detailed Information (XLS, 160k) Sulfur Dioxide Summary (5pp, 75k) Detailed Information (XLS, 186k) Nitrogen Dioxide Summary (PDF, 26k) Detailed Information (XLS, 128k) Lead Summary (PDF, 177k) Detailed Information (XLS, 373k) |
2007 |
PM2.5
Summary (PDF, 301k) Detailed Information (XLS, 11.6 MB) PM10 Summary (PDF, 231k) Detailed Information (XLS, 454k) Ozone Summary (PDF, 114k) Detailed Information (XLS, 662k) Carbon Monoxide Summary (PDF, 96k) Detailed Information (XLS, 123k) Sulfur Dioxide Summary (PDF, 84k) Detailed Information (XLS, 180k) Nitrogen Dioxide Summary (PDF, 33k) Detailed Information (XLS, 133k) Lead Summary (PDF, 101k) Detailed Information (XLS, 159k) |
2006 |
PM10
Summary (PDF, 180k) Detailed Information (XLS, 45k) Ozone Summary (PDF, 86k) Detailed Information (XLS, 738k) Carbon Monoxide Summary (PDF, 44k) Detailed Information (XLS, 28k) Sulfur Dioxide Lead |
2005 |
PM10
Summary (4pp, 34k) Detailed Information (43k) Ozone Summary (9pp, 71k) Detailed Information (564k) Changes in Design Values in Ozone and PM 2.5 Nonattainment Areas (PDF) (3pp, 763k) Report on Air Quality in Nonattainment Areas For 2003-2005 Covering Ozone, Particulate Matter, Carbon Monoxide, Sulfur Dioxide, Nitrogen Dioxide, and Lead: Technical Summary (November 2006) (PDF, 478k) |
Contacts: Dennis Doll (General Information)
Doll.Dennis@epa.gov
(919)
541-5693
Mark Schmidt (Lead, PM10, PM2.5)
Schmidt.Mark@epa.gov
(919)
541-2416
Ben Wells (Ozone)
Wells.Benjamin@epa.gov
(919)
541-7507
Rhonda Thompson (Carbon Monoxide, Nitrogen Dioxide, Sulfur Dioxide)
Thompson.Rhonda@epa.gov
(919)
541-5538