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Test methods which have been approved in the Federal Register as final rules. This website provides downloadable official, legal Federal Register Versions.
Proposed test methods that have not yet been published in the Federal Register.
These methods are approved alternatives to the methods required by 40 CFR Parts 60, 61 and 63. These test methods may be used to determine compliance with the requirements of these Parts without further EPA approval.
Test methods that may change based on the review of public comment or additional studies.
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 Emissions Measurement Center provides guidance and technical expertise on the use of emissions testing methods.
A resource for information on all aspects of air quality. This website offers articles with both technical writing for environmental professionals, as well as plain English for those that are not as familiar with the terms.
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.
The Federal Register is the daily publication for rules, proposed rules, and notices of Federal Agencies.
The Aerometric Information Retrieval Service (AIRS) offers a computer database for information about airborne illnesses in the United States and other World Health Organization countries.
The Occupational Safety and Health Administration (OSHA) ensures safe and healthful workplaces for all employees by setting and enforcing standards and providing training, outreach and educational assistance.
This website includes resources to explore the Federal Register and the Code of Federal Regulations.
A list of commonly used environmental terms and their definitions.
An online conversion calculator for a number of different units.
Metric conversion charts and calculators.
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