ODOUR MONITORING

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Importance of Odour Monitoring

Odour emission monitoring is crucial to the regulation and control of environmental odours. Before you can define the extent of an odour problem, you need first to identify potential sources of odour emissions and understand their magnitude and characteristics.

Sulfides:(SO2, H2S)

About
Sulfur dioxide (SO2) is an acid-forming, colorless, foul-smelling and toxic gas. The toxicity of Hydrogen Sulfide (H2S) is comparable with that of carbon monoxide.

Sources
Industrial Waste, Petroleum Refineries, Vehicle Emission, Volcanos etc.

Health Hazards
Sulphides poison several different systems in the body, although the nervous system is most affected. It causes increased respiratory symptoms and disease, difficulty in breathing, and premature deaths.

Regulation
10 ppm is the U. S. Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL) (8 hour time-weighted average) for H2S and 5 ppm (13  mg/m3) time-weighted average for SO2.

NH3

About
Ammonia (NH3) is present in the atmosphere naturally as well as an industrial pollution.

Sources
Fertilizers, Nitrogenous animal and vegetable matter

Health Hazards 
Respiratory disease, such as emphysema and bronchitis, and can aggravate existing heart disease, leading to increased hospital admissions and premature death.

Regulation 
The U. S. Occupational Safety and Health Administration (OSHA) has set a 15-minute exposure limit for gaseous ammonia of 35 ppm by volume in the environmental air and an 8-hour exposure limit of 25 ppm by volume.

4CH3SH(Methyl Mercaptan)

About
Methyl Mercaptan is a colorless, flammable gas with a distinct odour.

Sources 
Decaying organic matter in marshes, petroleum distillates, and emissions from pulp mills.

Health Hazards 
High doses of Methyl Mercaptan in industrial settings can cause headaches, dizziness, nausea and eye irritation.

Regulations
The U. S. Occupational Safety and Health Administration (OSHA) has set ceiling limit at 10 ppm.