{HEAD ~ These various contaminants} are suspended in, adhered to or absorbed on the foregoing gases and {TAIL ~ objects} and they may exert mortal, acute, subacute, chronic or transient adverse effects on the health of human beings and other animals when they absorb such contaminants and come in close contact therewith, they may thus give them unpleasant feelings and they may cause environmental pollution through the discharge, leakage and accumulation thereof 
are adhered to
{ HEAD ~ These various contaminants } are suspended in , adhered to or absorbed on the foregoing gases and { TAIL ~ objects } and they may exert mortal , acute , subacute , chronic or transient adverse effects on the health of human beings and other animals when they absorb such contaminants and come in close contact therewith , they may thus give them unpleasant feelings and they may cause environmental pollution through the discharge , leakage and accumulation thereof
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