In underground sewers, operators may be at risk from harmful inhalation. Large concentrations of methane in enclosed locations can result in dangers as significant amounts of methane reduce the level of oxygen while in the air. Oxygen deficiency can result in headache, nausea, dizziness, and also unconsciousness. When sewage backs https://landen2rahp.develop-blog.com/37502643/about-methods-of-cleaning-sewage-drains-in-bisha