Sewer odor is a complex mixture of toxic and nontoxic gases. Highly harmful components of sewer gas include hydrogen sulfide and ammonia. Sewer odor also contains methane, carbon dioxide, sulfur dioxide, and nitrous oxides. Exposure to low levels of hydrogen sulfide irritates the eyes and respiratory tract (that includes your nose, nasal cavity, pharynx, larynx, trachea, bronchi, and lungs). Other symptoms include,
Exposure to high concentrations of hydrogen sulfide can interfere with the sense of smell, making this warning signal unreliable. At extremely high levels, hydrogen sulfide can cause immediate loss of consciousness and death. If you smell sewer odor, address it now!