These methods are approved alternatives to the methods required by 40 CFR Parts 60, 61 and 63 as described by the General Provisions of the corresponding Parts and as further explained in a Federal Register notice dated January 30, 2007. As such, the methods may be used by sources for determining compliance with the requirements of these Parts per their specified applicability provisions without further EPA approval. The Administrator, or designee (currently Steffan Johnson, Group Leader of the Measurement Technology Group in the Air Quality Assessment Division of the Office of Air Quality Planning and Standards), has approved these methods for the specified applications; this approval has been documented through an official EPA letter. These methods include quality control and quality assurance procedures that must be met. The EPA staff may not necessarily be the technical experts on these methods.

The Federal Register approval notices and the Alternative Test Methods are available below. 

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.

Federal Register Notices Formally Approving Alternative Test Methods

Approved Alternative Test Methods

• ALT-001 Sulfur Dioxide (SO₂) Interference in Methods 7 and 7A (PDF) (1 pg, 5 K, November 9, 1988)
• ALT-002 Evaluation of Gas Tanks for Carbon Monoxide (CO) Analysis (PDF) (1 pg, 4 K, December 20, 1988)
• ALT-003 Potential Safety Hazard in Method 101A (PDF) (2 pp, 8 K, August 3, 1990)
• ALT-004 Alternative for Methods 3A and 6C (PDF) (1 pg, 5 K, August 30, 1993)
• ALT-005 Acceptability of Teflon Bags (PDF) (2 pp, 9 K, February 20, 1998)
• ALT-006 ICP Alternative for Methods 12, 101A, 104, and 108A (PDF) (2 pp, 7 K, July 18, 1991)
• ALT-007 Now superseded by specific provisions in revised instrumental methods 3A, 6C, 7E, 10, and 20.
• ALT-008 Alternative Moisture Measurement Method Midget Impingers (PDF) (4 pp, 66 K, May 19, 1993)
• ALT-009 Alternative Method 5 Post-Test Calibration (PDF) (2 pp, 24 K, June 21, 1994)
• ALT-010 Alternatives for Method 11 (PDF) (2 pp, 8 K, June 1, 1994)
• ALT-011 Alternative Method 2 Thermocouple Calibration (PDF) (2 pp, 15 K, June 21, 1994)
• ALT-012 Alternative Stack Gas Vol Flow Rated Determination (PDF) (3 pp, 45 K, May 23, 1994)
• ALT-013 Alternative for Method 20, Section 5.6.1 (PDF) (2 pp, 8 K, September 28, 1994)
• ALT-014 Methods 306 and 306A Section 5.2.3 Decorative and Hard Chromium Electroplating and Anodizing Operations (PDF) (1 pg, 7 K, May 12, 1997)
• ALT-016 Optical Scintillation Anemometers for Aluminum Smelter Potroom Roof Monitor Effluent Velocity (PDF) (9 pp, 22 K, July 9, 1998)
• ALT-017 Determination of Gaseous Organic Compounds by Direct Interface GC/MS (PDF) - Please note there is a Consensus based ASTM Method, ASTM D6420-98, that is similar to this alternative test method and we strongly encourage you to consider its use in accordance with the applicability as specified in the method. (24 pp, 68 K, July 23, 1998)
• ALT-018 Alternative Testing Procedures for Application of Method 9 to Multiple Emission Points Under 40 CFR 60, Subparts LL and OOO (PDF) (3 pp, 10 K, April 20, 1999)
• ALT-019 Alternative to Method 24 for Electrical Insulating Varnishes (PDF) (1 pg, 3 K, April 20, 1999)
• ALT-020 Alternative Capture Efficiency Procedure for Bakery Ovens (PDF) (4 pp, 104 K, March 20, 1997)
• ALT-021 Approval of Method 25B for Marine Vessel Loading (PDF) (2 pp, 53 K, March 31, 1999)
• ALT-022 Modification of Method 25C for Landfills (PDF) (1 pg, 28 K, July 2, 1998)
• ALT-023 Clarification and Modification of Method 25C for Landfills (PDF) (2 pp, 88 K, March 26, 1998)
• ALT-024 Alternative Sampling Technique for Method 25E (PDF) (1 pg, 35 K, July 28, 1996)
• ALT-025 Use of Method 205 with any Part 60 or 63 method, performance specification, or quality assurance requirement (PDF) (1 pg, 47 K, September 3, 1999)
• ALT-026 Approval of Method 316 as an alternative to Method 18 for formaldehyde plants subject to Subpart III of Part 60 (PDF) (2 pp, 45 K, April 28, 1998)
• ALT-027 Approval of Method 316 as an alternative to Method 18 for formaldehyde plants subject to the HON (PDF) (2 pp, 43 K, March 4, 1998)
• ALT-028 Use of CARB 431 at Sterilization Facilities (PDF) (1 pg, 32 K, April 19, 1999)
• ALT-029 Use of NCASI method for methanol, acetone, acetaldehyde, MEK, and formaldehyde for CFR Part 63, Subpart S (PDF) (2 pp, 45 K, August 12, 1997)
• ALT-030 Use of SCAQMD Method 205.1 as an alternative to Method 306 for total chromium (PDF) (3 pp, 114 K)
• ALT-031 Approval of Method 2F, 2G and 2H as alternatives to Method 2 in 40 CFR Part 60, 61, or 63 (PDF) (3 pp, 155K, August 26, 1999)
• ALT-032 Approval of Procedure CSA B415.1 for use with Residential Wood Heaters 40 CFR Part 60, Subpart AAA (PDF) (2 pp, 71 K, June 1, 2007)
• ALT-033 This approval has been replaced by ALT-040 below
• ALT-034 Approved Modifications to Method 23 for Secondary Aluminum Facilities (PDF) (2 pp, 102 K, August 23, 2007)
• ALT-035 Approval of NCASI Method CI/SG/PULP-94.03 for Kraft Pulp Mills (PDF) (2 pp, 62 K, September 18, 2007)
• ALT-036 Approval of Method 23 Modifications for Cement Kilns (PDF) (2 pp, 46 K, September 28, 2007)
• ALT-037 Approval of Method 320 for Pharmaceutical Facilities (PDF) (1 pg, 39 K, September 28, 2007)
• ALT-038 Approval of Method 320 as an Alternative to Method 18 for Cellulose Manufacturing (PDF) (1 pg, 45 K, October 28, 2007)
• ALT-039 Approval of Method 29 for Sludge Drying and Sludge Incineration Facilities (PDF) (2 pp, 75 K, December 7, 2007)
• ALT-040 Approved Modifications to Method 25C for Landfills (PDF) (1 pg, 55 K, January 8, 2008)
• ALT-041 Alternative Sampling Procedure Approval for Method 25C for Landfills (PDF) (8 pp, 355 K, January 29, 2008)
• ALT-042 Approval of Modifications to Methods 3C and 22 for Landfills (PDF) (1 pg, 54 K, March 13, 2008)
• ALT-043 Approval of Method 26 Instead of Method 26A at Secondary Aluminum Production Facilities (PDF) (2 pp, 70 K, May 1, 2008)
• ALT-044 Approval of Alternative Relative Accuracy Procedure for 40 CFR Part 63, Subpart EEE (PDF) (1 pg, 56 K, May 23, 2008)
• ALT-045 Approval of Alternative Calibration Procedure for Method 3C for Landfills (PDF) (2 pp, 62 K, August 7, 2008)
• ALT-046 Approval of Method 320 as Alternative to Methods 6C, 7E and 10 for Subpart Db Sources (PDF) (2 pp, 60 K, September 26, 2008)
• ALT-047 Approval of Alternative Analysis for Methods 12, 103, 104, 108, 108A, 108B, and 306 (PDF) (1 pg, 51 K, October 6, 2008)
• ALT-048 Approval of Alternative for Determining Sample Volume and Flow Rate for Method 5 (PDF) (1 pg, 56 K, October 28, 2008)
• ALT-049 Approval of Alternative Relative Accuracy Procedure for PS-4B (PDF) (2 pp, 111 K, November 4, 2008)
• ALT-050 Approval of SW-846 Method 8260B for MON Rule (PDF) (1 pg, 66 K, January 7, 2009)
• ALT-051 Approval of Method 29 as Alternative to Methods 101A, 103, and 104 (PDF) (2 pp, 152 K, December 19, 2008)
• ALT-052 Approved Method 23 Modifications for Incinerators and Waste Combustors (PDF) (2 pp, 126 K, February 24, 2009)
• ALT-053 Approved Procedures for Methods 26 and 29 for Subpart EEE Rotary Kiln Incinerators (PDF) (2 pp, 126 K, April 15, 2009)
• ALT-054 Alternative Sampling Approach Approval for Method 25C at Landfills (PDF) (2 pp, 113 K, April 29, 2009)
• ALT-055 Approval of Mass Flowmeter to Measure Flow from Landfill Flares (PDF) (1 pg, 455 K, May 20, 2009)
• ALT-056 Approval of Teflon Probes in Method 26 (PDF) (1 pg, 44 K, June 5, 2009)
• ALT-057 Approval of Method 25A for Off-Site Waste Facilities (PDF) (1 pg, 67 K, June 11, 2009)
• ALT-058 Approval of ASTM D396 for Subpart Dc Sources (PDF) (1 pg, 56 K, June 24, 2009)
• ALT-059 Approval of Unheated Sampling Lines in ASTM D6522 for Subpart ZZZZ Sources (PDF) (1 pg, 60 K, June 24, 2009)
• ALT-060 Approval of ALT-008 as an Alternative to Method 4 (PDF) (1 pg, 48 K, August 26, 2009)
• ALT-061 Withdrawal Document - Approval of Single Point Testing for Subpart JJJJ has been withdrawn. (2 pp, 114 K, March 10, 2014)
• ALT-062 Approval of Subpart EEE Testing Modifications (PDF) (14 pp, 949 K, November 16, 2009)
• ALT-063 Approval of Method 6C for Subpart H (PDF) (1 pg, 480 K, December 3, 2009)
• ALT-064 Approval of Various Modifications for the Hazardous Waste Combustor MACT (PDF) (16 pp, 1 MB, January 12, 2010)
• ALT-065 Approval of Methods 23 and 320 for 40 CFR Part 63, Subpart EEE (PDF) (1 pg, 70 K, January 29, 2010)
• ALT-066 Approval of Alternative to Method 18 for 40 CFR Part 60, Subpart JJJJ (PDF) (1 pg, 59 K, February 25, 2010)
• ALT-067 Approval of Modifications to Method 5A for Various Rules (PDF) (1 pg, 57 K, February 25, 2010)
• ALT-068 Approval of Method 24 Alternative for Concrete Sealers and Primers (PDF) (1 pg, 54 K, March 4, 2010)
• ALT-069 Approval of Alternatives to Methods 3B and 4 for the Hazardous Waste Combustor MACT (PDF) (2 pp, 93 K, March 4, 2010)
• ALT-070 Approval of Method 320 In Place Of Method 7 for Nitric Acid Plants (PDF) (1 pg, 63 K, March 24, 2010)
• ALT-071 Approval of Modifications to Method 16A for Kraft Pulp Mills and Petroleum Refineries (PDF) (21 pp, 966 K, March 24, 2010)
• ALT-072 Approval of Method 25A in Place of Method 18 for Site Remediation MACT (PDF) (1 pg, 67 K, April 21, 2010)
• ALT-073 Approval of Alternative Flow Rate Measurement Procedure for Flares (PDF) (1 pg, 57 K, April 22, 2010)
• ALT-074 Approval of Modifications to Method 15 for Cellulose Products Manufacturing (PDF) (2 pp, 93 K, April 29, 2010)
• ALT-075 Approval of Alternative Monitoring Procedures for Subpart Db (PDF) (2 pp, 87 K, June 9, 2010)
• ALT-076 Approval of GPA Method 2261 for Subpart KKK, Part 60 Sources (PDF) (1 pg, 63 K, June 23, 2010)
• ALT-077 Approval of Method 320 for 40 CFR Part 63, Subpart HHHH Sources (PDF) (1 pg, 54 K, June 30, 2010)
• ALT-078 Clarification of Approval of an Alternative to Method 18 for 40 CFR Part 60, Subpart JJJJ (PDF) (1 pg, 56 K, July 21, 2010)
• ALT-079 Approval of NCASI Method for 40 CFR Part 63, Subpart S Sources (PDF) (1 pg, 67 K, August 19, 2010)
• ALT-080 Approval of Alternative Flow Measurement for Flares (PDF) (1 pg, 59 K, October 13, 2010)
• ALT-081 Approval of Alternative Sampling Procedure for Landfills (PDF) (1 pg, 71 K, March 31, 2011)
• ALT-082 Approval of Method 9 Alternative Revised (PDF) (2 pp, 600 K, May 15, 2012)
• ALT-083 Broad approval withdrawn on 2/1/2012 to ensure proper implementation of delegated authority 
• ALT-084 Approval of Updated ASTM Method in PS-1 (PDF) (4 pp, 123 K, June 22, 2011)
• ALT-085 Approval of Alternative ASTM Method for Boilers (PDF) (1 pg, 58 K, July 7, 2011)
• ALT-086 Approval of Alternative ASTM Method for Method 24 (PDF) (1 pg, 58 K, July 26, 2011)
• ALT-087 Withdrawal Document - Waiver of Stratification Tests for Engines has been withdrawn. (2 pp, 114 K, March 10, 2014)
• ALT-088 Approval of Method 2 Alternative for Landfills (PDF) (1 pg, 59 K, July 27, 2011)
• ALT-089 Approval of Method 15 for Boilers (PDF) (1 pg, 50 K, August 2, 2011)
• ALT-090 Approval of Alternative Method for Subpart Kb Sources (PDF) (15 pp, 722 K, August 3, 2011)
• ALT-091 Approval of Alternative Procedures for Determination of Moisture Content (PDF) (2 pp, 109 K, May 24, 2012)
• ALT-092 Approval of Alternative Calibration Procedures for Method 7E (PDF) (2 pp, 141 K, June 28, 2012)
• ALT-093 Approval of Alternative Sampling Procedures for Secondary Aluminum (PDF) (2 pp, 118 K, August 16, 2012)
• ALT-094 Approval of SO2 CEMs for Cellulose Manufacturing (PDF) (1 pg, 74 K, October 22, 2012)
• ALT-095 Approval of Flow Rate CEMs for Petroleum Refineries (PDF) (1 pg, 80 K, November 7, 2012)
• ALT-096 Approval of TECO-55I for RICE (PDF) (1 pg, 86 K, November 8, 2012)
• ALT-097 Approval of TECO-55C for Landfills this letter dated 12/11/2012 replaces the 11/8/2012 version (PDF) (2 pp, 125 K, December 11, 2012)
• ALT-098 Approval of Alternative Method 18 Sampling Procedure for Section 60.18 Flares (PDF) (2 pp, 128 K, March 18, 2013)
• ALT-099 Approval of Optical Flow Meters for Flares (PDF) (1 pg, 73 K, April 5, 2013)
• ALT-100 Approval of Canister Sampling with Method 18 for Flares (PDF) (3 pp, 262 K, May 7, 2013)
• ALT-101 Now superseded by ALT-137 below
• ALT-102 Approval of Alternative CGA Material for PS-2 for Flares (PDF) (1 pg, 639 K, August 28, 2013)
• ALT-103 Approval of SW-846 Methods For 40 CFR 61, Subpart E Sources (PDF) (1 pg, 65 K, September 16, 2013)
• ALT-104 Approval of Alternative to Method 10 for Engines (PDF) (1 pg, 628 K, September 16, 2013)
• ALT-105 Approval of Alternative Calibration Gases for Bulk Terminals (PDF) (3 pp, 152 K, May 12, 2014)
• ALT-106 Approval of Alternative VOC Measurement for Engines (PDF) (3 pp, 169 K, June 6, 2014)
• ALT-107 Approval of CO and O2 CEMS for RICE, Subpart ZZZZ (PDF) (2 pp, 1 MB, November 20, 2013)
• ALT-108 Approval of Alternative Minimum Sample Volume for Gold Mines, Subpart EEEEEEE (PDF) (2 pp, 811 K, January 8, 2014)
• ALT-109 Broad approval removed as the approved modifications have now been incorporated directly into Method 22 (see 83 FR 11/14/2018, 56713)
• ALT-110 Approval of Method 7E for Nitric Acid Plants under 40 CFR 60, Subpart G (PDF) (3 pp, 157 K, January 17, 2015)
• ALT-111 Approval of Method 5I for MATS, Subpart UUUUU (PDF) (September 17, 2015)
• ALT-112 Approval of Modification to Performance Specification 18 for IP-CEMS (PDF) (2 pp, 122 K, September 25, 2015)
• ALT-113 Approval of Alternative Approach for Performance Test at 0 degrees F, 40 CFR Part 60, Subpart KKKK (PDF) (2 pp, 816 K, December 30, 2015)
• ALT-114 Approval of Alternative Method for Preparation of HCl Gas Standards for PS 18 and Procedure 6 (PDF) (5 pp, 340 K, February 22, 2016)
• ALT-115 Use of Method 19 in Place of Moisture Monitoring When Measuring CO Emissions for the Boiler MACT (PDF) (4 pp, 1 MB, March 2, 2016)
• ALT-116 Alternative NO2 Test Gas for Method 7E (PDF) (1 pg, 56 K, January 27, 2014)
• ALT-117 Clarification of TID-019 – DGM Exit Temperature (PDF) (2 pp, 87 K, March 15, 2016)
• ALT-118 Alternative Method for Preparation of NIST-Traceable Elemental Mercury Gas Standards in Compressed Gas Cylinders (PDF) (5 pp, 290 K, May 24, 2016)
• ALT-119 Approval of Alternative Procedure for Low-level Mercury Measurement of PS12B Sorbent Traps (PDF) (3 pp, 618 K, May 26, 2016)
• ALT-120 Approval withdrawn as it expired on 1/1/2019 and has been superseded by ALT-132. (PDF) (3 pp, 8 MB, December 18, 2018)
• ALT-121 Approval to use Method 3A when evaluating the performance of O2 and CO2 monitors under 40 CFR 60, Subpart Ja (PDF) (2 pp, 726 K, August 10, 2017)
• ALT-122 Alternative Sample Collection, and Temperature, Pressure Correction for Method 325A/B (PDF) (3 pp, 706 K, September 11, 2017)
• ALT-123 Alternative Test Method for Diluent Measurement to Support Particulate Matter Testing under 40 CFR 63, Subpart UUUUU (PDF) (7 pp, 3 MB, March 6, 2018)
• ALT-124 Process Mass Spectometry as an alternative to PS 9 to determine BTU for 40 CFR Part 63 Subpart CC flare feed gas (PDF) (3 pp, 5 MB, February 5, 2018)
• ALT-125 Alternative to Use Procedures from ASTM E3053-17 in Certification of Wood Heaters for 2020 Cord Wood Alternative Standard (PDF) (3 pp, 2 MB, February 28, 2018)
• ALT-126 Alternative to use probe rinse and front filter holder recovery in procedures in Method 5 in place of procedure in ASTM E2515-11 for certification of wood stoves, hydronic heaters and forced air furnaces (PDF) (2 pp, 2 MB, March 6, 2018
• ALT-127 Alternative to use Procedures from ASTM E3053-17 in Certification of Wood Heaters using Cord Wood (PDF) (4 pp, 3 MB, April 13, 2018)
• ALT-128 Method 25 Alternative Filter Holder System (PDF) (4 pp, 3 MB, April 18, 2018)
• ALT-129 Sorbent Trap Method for HCl Emissions from Coal-Fired Electric Utility Steam Generating Units (PDF) (5 pp, 9 MB, May 30, 2018)
• ALT-130 Approval to use SW-846 Method 826C or SW-846 Method 826D for 40 CFR Subpart HHHHHHH (PDF) (2 pp, 2 MB, October 17, 2018)
• ALT-131 Approval to Use NHV in Place of Component BTU for Select QC Criteria in 40 CFR 63, Subpart CC Flare Fuel Measurements (PDF) (3 pp, 2 MB)
• ALT-132 Approval of Modified Above Span Calibration Procedures for Hg CEMS at Portland Cement Plants (PDF) (3 pp, 6 MB, December 18, 2018)
• ALT-133 Approval of alternative analytical approach for Methods 6, 8, 15A, and 16A CFR Part 60 (PDF) (3 pp, 632 K, August 5, 2019)
• ALT-134 Approval to use CSA-B415 burn rate settings in lieu of M28 WHH (PDF) (3 pp, 579 K, August 19, 2019)
• ALT-135 Approved Modifications to Method 23 for Secondary Lead Facilities (PDF) (2 pp, 364 K, September 25, 2019)
• ALT-136 Alternative Analytical Approach for Method 18 (PDF) (2 pp, 192 K, June 19, 2020)
• ALT-137 Alternative Test Methods for Petroleum Products and Crude Oil Vapor Pressure (PDF) (3 pp, 283 K, June 19, 2020)
• ALT-138 Approval to use OTM-39 is lieu of ASTM 6522-00 for 40 CFR Part 60 Subpart JJJJ and 40 CFR Part 63, Subparts ZZZZ and DDDDD
• ALT-139 Approval to Use Method 30B for Low Particulate Anode Bake Ovens at Primary Aluminum Plants