How to Treat a Jammed Finger - Health Sutra - Duration: 1:54. Health Sutra - Best Health Tips 79,423 views
Brown rat. The brown rat, also referred to as common rat, street rat, sewer rat, Hanover rat, Norway rat, Norwegian rat, or wharf rat (Rattus norvegicus) is one of the best known and most common rats.
Sewer gas is a complex mixture of toxic and non-. toxic gases which collect in the sewage system at. varying levels depending on the source. Sewer gas. is formed during the decay of household and. industrial waste. Highly toxic components of sewer. gas include hydrogen sulfide and ammonia.