‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?

Related Mcqs:

Which of the following fine dust removal equipments is the most efficient ?

A. Bag filter B. Scrubber C. Electrostatic precipitator D. Cyclone separator...

Which is the most practical and economical method for removal of suspended solid matter from polluted water ?

A. Sedimentation B. Skimming off C. Chlorination D. Biological oxidation...

Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?

A. Grinding B. Machining C. Cutting D. Polishing...

Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the_______________?

A. Forestation B. Rain C. Green house effect D. Vegetation...

Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called_________________?

A. Fumes B. Mists C. Smoke D. Aerosols...