This page contains links to EPA's Compendium of Methods for the Determination of Toxic Organic Compounds in Ambient Air.   The Compendium contains a set of 17 peer reviewed, standardized methods for the determination of volatile, semi-volatile, and selected toxic organic pollutants in the air. EPA has developed this compendium of methods to assist Federal, State, and local regulatory personnel in developing and maintaining necessary expertise and up-to-date monitoring technology for characterizing organic pollutants in the ambient air.

• Compendium of Methods for the Determination of Toxic Organic Compounds in Ambient Air - Second Edition (PDF)(37 pp, 206 K, January 1999, EPA/625/R-96/010b)
  Cover page, Foreword, Table of Contents, Method Summaries, and Project Summary
• Appendum to Compendium of Methods for the Determination of Toxic Organic Compounds in Ambient Air - Second Edition (PDF)(9 pp, 59 K, October 4, 2000)
  Addendum
• Method TO-1 (PDF)(34 pp, 360 K, April, 1984)
  Method for the Determination of Volatile Organic Compounds (VOCs) in Ambient Air Using Tenax® Adsorption and Gas Chromatography/Mass Spectrometry (GC/MS)
• Method TO-2 (PDF)(32 pp, 341 K, April, 1984)
  Method for the Determination of Volatile Organic Compounds (VOCs) in Ambient Air by Carbon Molecular Sieve Adsorption and Gas Chromatography/Mass Spectrometry (GC/MS)
• Method TO-3 (PDF)(20 pp, 197 K, April, 1984)
  Method for the Determination of Volatile Organic Compounds in Ambient Air Using Cryogenic Preconcentration Techniques and Gas Chromatography with Flame Ionization and Electron Capture Detection
• Method TO-4A (PDF)(53 pp, 2 MB, January 1999)
  Determination of Pesticides and Polychlorinated Biphenyls in Ambient Air Using high Volume Polyurethane Foam (PUF) Sampling Followed by Gas Chromatographic/ Multi-Detector Detection (GC/MD)
• Method TO-5 (PDF)(22 pp, 303 K, April, 1984)
  Determination of Aldehydes and Ketones in Ambient Air Using High Performance Liquid Chromatography (HPLC)
• Method TO-6 (PDF)(28 pp, 803 K, September, 1986)
  Determination of Phosgene in Ambient Air Using High Performance Liquid Chromatography (HPLC)
• Method TO-7 (PDF)(19 pp, 327 K, September, 1986)
  Method for the Determination of N-nitrosodimethylamine (NDMA) in Ambient Air Using Gas Chromatography
• Method TO-8 (PDF)(25 pp, 761 K, September, 1986)
  Method for the Determination of Phenol and Methylphenols (Cresols) in Ambient Air Using High Performance Liquid Chromatography
• Method TO-9A (PDF)(94 pp, 3 MB, January 1999)
  Determination of Polychlorinated, Polybrominated And Brominated/Chlorinated Dibenzo-p-Dioxins And Dibenzofurans In Ambient Air
• Method TO-10A (PDF)(37 pp, 1 MB, January 1999)
  Determination Of Pesticides And Polychlorinated Biphenyls In Ambient Air Using Low Volume Polyurethane Foam (PUF) Sampling Followed By Gas Chromatographic/Multi-Detector Detention (GC/MD)
• Method TO-11A (PDF)(56 pp, 1 MB, January 1999)
  Determination of Formaldehyde in Ambient Air Using Adsorbent Cartridge Followed by High Performance Liquid Chromatography (HPLC)
• Method TO-12 (PDF)(35 pp, 677 K, April, 1984)
  Method for the Determination of Non-methane Organic Compounds (NMOC) in Ambient Air Using Cryogenic Preconcentration and Direct Flame Ionization Detection (PDFID)
• Method TO-13A (PDF)(84 pp, 2 MB, January 1999)
  Determination of Polycyclic Aromatic Hydrocarbons (PAHs) in Ambient Air Using Gas Chromatographic/Mass Spectrometry (GC/MS)
• Method TO-14A (PDF)(90 pp, 4 MB, January 1999)
  Determination Of Volatile Organic Compounds (VOCs) In Ambient Air Using Specially Prepared Canisters With Subsequent Analysis By Gas Chromatography
• Method TO-15 (PDF)(67 pp, 2 MB, January 1999)
  Determination of Volatile Organic Compounds (VOCs) In Air Collected In Specially-Prepared Canisters And Analyzed By Gas Chromatography Mass Spectrometry (GC/MS)
• Method TO-15 - Supplement (PDF)(40 pp, 1 MB, November 2002)
  Method TO-15 Supplement - Analysis of 1,1-DCE at pptv Concentrations
• Method TO-15A (PDF)(112 pp, 4 MB, September, 2019)
  Determination of Volatile Organic Compounds (VOCs) in Air Collected in Specially Prepared Canisters and Analyzed by Gas Chromatography–Mass Spectrometry (GC-MS)
• Comparison of Acceptance Criteria for EPA Method TO-15A to NATTS Technical Assistance Document (TAD) (PDF)(7 pp, 288 K)
  Table of Acceptance Criteria for EPA Method TO-15A (September 2019) compared to National Air Toxics Trends Sites (NATTS) Technical Assistance Document (TAD) Revision 3 (October 2016)
• Webinar on EPA Method TO-15A for NATTS Participants (PDF)(55 pp, 3 MB)
  Important Updates for the NATTS Network and Ambient Air Measurements
• To-15A Webinar Comments Table (PDF)(23 pp, 350 K)
• Method TO-16 (PDF)(45 pp, 252 K, January 1999)
  Long-Path Open-Path Fourier Transform Infrared Monitoring Of Atmospheric Gases
• Method TO-17 (PDF)(53 pp, 353 K)
  Determination of Volatile Organic Compounds in Ambient Air Using Active Sampling Onto Sorbent Tubes