1. ToxFAQs for hydrogen sulfide. Public health statement for hydrogen sulfide. Agency for toxic substances and disease registry, US Department of Health and Human Services, September 2004
2. US Clean Air Act. Title 1—air pollution prevention and control, section A—air quality and emissions limitations, as amended 1990
3. San Francisco Bay Area Air Quality Management District, regulation 9—inorganic gases pollutants, rule 2—hydrogen sulfide, rule 5—hydrogen sulfide from geothermal power plants, May 1999
4. State of New York State Department of Environmental Conservation rules and regulations subpart 257-10, air quality standards—hydrogen sulfide (original rule effective 5/1/72, revisions effective 8/9/77); subpart 223.6—sulfur compound emissions (effective date 8/23/79, revisions to part 223 effective 8/9/84)
5. United States Code of Federal Regulations. Title 40—protection of the environment, chapter 1—Environmental Protection Agency, parts 116.4 designation of hazardous substances, 261.33, 302.4 designation of hazardous substances and 355 appendix A the list of extremely hazardous substances and their threshold planning quantities, e-CFR data are current as of October 1, 2006