Hydrogen Sulfide H2S causes serious health problems. It is commonly known as sewer gas. Symptoms causes nausea, respiratory problems, eye irritant, headache, dizziness, and fatigue. Higher levels of h2s can lead to unconsciousness, and even death. 

IAQ Environmental tests for hydrogen sulfide. Our equipment has a dedicated sensor just for h2s. If there is Hydrogen Sulfide in the air we will find it!