Chemical Engineering - Environmental Engineering
Exercise : Environmental Engineering - Section 6
11.
'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
12.
Inhalation of silica dust by human being causes
13.
Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage ?
14.
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called
15.
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
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