Air pollution

 Methane

Properties of methane is described below:

PHYSICAL STATE; APPEARANCE:
COLOURLESS, COMPRESSED OR LIQUEFIED GAS , WITH NO ODOUR.

PHYSICAL DANGERS:
The gas is lighter than air.

CHEMICAL DANGERS:


OCCUPATIONAL EXPOSURE LIMITS:
TLV: simple asphyxiant (ACGIH 2000).
MAC not established.

ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation.

INHALATION RISK:
On loss of containment this gas can cause suffocation by lowering the oxygen content of the air in confined areas.

EFFECTS OF SHORT-TERM EXPOSURE:
Rapid evaporation of the liquid may cause frostbite.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:

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For more information see website: 
http://www.cdc.gov/niosh/ipcsneng/neng0291.html