Gas chamber carbon monoxide as the lethal agent. Sometimes a box filled with anesthetic gas is used to anesthetize small animals for surgery or euthanasia. Gas chamber A gas chamber is an apparatus for killing humans or other animals with gas, consisting of a sealed chamber into which a poisonous or asphyxiant gas is introduced. The most commonly used poisonous agent is hydrogen cyanide; carbon dioxide and carbon monoxide have also been used. Gas chambers were used as a method of execution for condemned prisoners in the United States beginning in the 1920s and continue to be a legal execution method in
Lawn mower measured between 86-95 decibels (A-weighted) and from riding lawn mowers between 88 and 96 dB(A); both types exceeded the National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit of 85 dB(A). To reduce the possibility of developing hearing loss and reduce noise pollution, users might consider the use of reel mowers or newer "green" or battery-operated mowers. Appropriate hearing protection such as earplugs or earmuffs will also help reduce the amount of sound that the user hears, which in turn can reduce hearing loss caused by lawnmowers. Lawn mower A lawn mower (also named as mower or lawnmower)