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CFR promulgated test methods have been in the Federal Register as final rules. This web site provides downloadable official, legal Federal Register Versions.
Federal Register proposed test methods have been published in the Federal Register as proposed rules, but have not yet been promulgated.
Approved Alternative Test Methods
These methods are approved alternatives to the methods required by 40 CFR Parts 60, 61 and 63. As such, they may be used to determine compliance with the requirements of these Parts without further EPA approval.
These methods are potentially subject to change based on the review of additional validation studies or on public comment as a part of adoption as a Federal test method.
The methods in this category are not likely to be technically supported by EPA staff and are more likely to change based on the review of additional validation studies or on public comment prior to adoption as a Federal reference method.
The EMC provides technical expertise and guidance specific to the implementation of the emission testing methods.
US EPA Office of Air Quality and Planning Standards
This US EPA web site is a rich resource for information on all aspects of air quality, both in technical language for environmental professionals and in plain English for lay people.
Title 40 CFR Electronic Documents
In 2000, the Office of the Federal Register (OFR) and the Government Printing Office created the Electronic Code of Federal Regulations (e-CFR) prototype. The OFR updates the e-CFR prototype on a frequent basis, providing the public with up-to-date access.
Federal Register Environmental Documents
The Federal Register is the daily publication for rules, proposed rules, and notices of Federal Agencies.
Aerometric Information Retrieval Service (AIRS)
AIRS is the world
The OSHA assures safe and healthful working conditions for working men and women by setting and enforcing standards and by providing training, outreach, education, and assistance.
This web site includes resources to explore the Federal Register and the Code of Federal Regulations.
This web site defines in non-technical language the more commonly used environmental terms.
ConvertUnits.com provides an online conversion calculator for all types of measurement units.
Metric conversion charts and calculators for metric conversions.