In underground sewers or other wastewater collection systems, the development and concentration of hydrogen sulfide causes offensive odors and corrosion can often go undetected until significant damage or failure occurs.

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Typically wastewater-related problem odor compounds such as hydrogen sulfide (H2S) are generated in the liquid phase, during the process of conveying the wastewater from its inception to treatment area.

Most wastewater-related odor problems are generated via bacterial activity within the waste streams, which when untreated, readily are released into the atmosphere and become vapor-phase odors.

Volatile organic compounds (VOCs) are carbon-based chemicals that easily evaporate into gaseous forms at ambient temperature. The human health risks associated with VOCs vary depending upon several factors including length of time and level of exposure.