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www.dhs.wisconsin.gov/air/sewergas.htm

Sewer gas is a complex mixture of toxic and nontoxic gases that can be present at varying levels depending upon the source. It is formed during the decay of household and industrial waste. Highly toxic components of sewer gas include hydrogen sulfide and ammonia. Sewer gas also contains methane, carbon dioxide, sulfur dioxide, and nitrous oxides.

en.wikipedia.org/wiki/Sewer_gas

Sewer gases may include hydrogen sulfide, ammonia, methane, esters, carbon monoxide, sulfur dioxide and nitrogen oxides. Improper disposal of petroleum products such as gasoline and mineral spirits contribute to sewer gas hazards. Sewer gases are of concern due to their odor, health effects, and potential for creating fire or explosions.

www.reference.com/health/dangers-breathing-sewer-gas-2b64e56035488a9e

The dangers of breathing sewer gas are hydrogen sulfide poisoning and asphyxiation, according to the Wisconsin Department of Health Services. Inhaling very high levels of hydrogen sulfide can lead to immediate loss of consciousness and death.

healthfully.com/side-effects-sewer-gas-inhalation-5295121.html

Side Effects of Sewer Gas Inhalation. Sewer gas forms when solid waste from humans and animals decomposes. The gas contains ammonia, methane and hydrogen sulfide, all of which are toxic when inhaled in high concentrations. People can die through asphyxiation when exposed to very high concentrations of sewer gas. More common effects include eye irritation, nausea and breathing difficulty.

www.burtonplumbingco.com/health-problems-caused-by-sewer-gas

Health Problems Caused By Sewer Gas. Sewer gas forms from decomposing solid waste. Both animals and humans can contribute to the waste that forms sewer gas. Sewer gas contains methane, ammonia, and hydrogen sulfide which are all toxic when inhaled. If exposed to very high concentrations of sewer gas, a person can asphyxiate and die.

www.nachi.org/sewer-gases-home.htm

Sewer gases pose the following risks to building occupants: hydrogen sulfide poisoning. Hydrogen sulfide is an explosive and extremely toxic gas that can impair several different systems in the body at once, most notably the nervous system.

www.justanswer.com/health/1bssa-effects-breathing-sewer-gas-long.html

What are the effects of breathing sewer gas for periods of time? Dr C. Hughes - Answered by a verified Health Professional

www.angieslist.com/articles/what-do-if-you-smell-sewer-gas-your-home.htm

Now back to my attic. The pipe also had a little U to keep the sewer gas smell out of my house. In the winter, when you're not running your AC unit, you're not getting any additional condensation. This U dried out and the sewer gases were coming directly into my AC unit/heater and venting into the house.

deltaplumbingatlanta.com/news/the-danger-sewer-gases-present-in-your-home

Gases leaking from your home’s sewer system can wreak havoc on your famly’s health. Avoid these risks with a professional pipe and drain inspection by Delta the Educated Plumber. Their experts can assess the condition of your pipes to ensure that you and your family remain safe from harmful gases.

www.osha.gov/SLTC/hydrogensulfide

The health effects of hydrogen sulfide depend on how much H 2 S a worker breathes and for how long. However, many effects are seen even at low concentrations. Effects range from mild, headaches or eye irritation, to very serious, unconsciousness and death.