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The atmosphere of industrial area loaded with chimines is considered harmful to health because:

[A].	There is more and more carbondioxide	[B].	There is carbonmomonoxide which can bind with Hb 230 times more than oxygen and its pressure of about 0.7 mm Hg is lethal
[C].	There is more water vapour which makes breathing difficult	[D].	The air has very low percentage of oxygen

Answer: Option B