Human exposure to hydrogen sulphide concentrations near wastewater treatment plants.

The hydrogen sulphide (HS) levels from wastewater treatment plants (WWTPs) in Curitiba, Brazil have been quantified for the first time. HS generated by anaerobic decomposition of organic matter in WWTPs is a cause for concern because it is an air pollutant, which can cause eye and respiratory irritation, headaches, and nausea. Considering the requirement for WWTPs in all communities, it is necessary to assess the concentrations and effects of gases such as HS on populations living and/or working near WWTPs.