Manholes and sewer openings are a common sight in communities across South Africa. Most people pass by them without a second thought. But what many don’t realise is that these access points can conceal a lethal threat: sewer gas. Invisible, fast-acting, and often undetectable by smell alone, this toxic mixture can overpower and kill within seconds. Understanding the makeup and dangers of sewer gas is critical for public safety. It’s not only maintenance workers who are at ris