when people enter manholes for cleaning in some cases they die.why?

In manholes some poisonous gases namely Hydrogen sulfide (H2S), Ammonia (NH3), Methane (CH4), Carbon Dioxide (CO2), Nitrogen Oxide (NOx), and Carbon Monoxide (CO) are produced and due to the toxic nature of these gases, sometimes person who have entered in manhole, dies.

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sometimes bec of lack of oxygen and sometimes bec of foul smell

 

thumbs up please  bec till now i have got 1 only

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 inside the manholes airation is neede but sometimes because of lack of airation there is no oxygen available and if you are inside them for a long time you may get suffocated and in some cases also die.we can case it as an occupational hazzard.

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