Haemoglobin combines with carbon monoxide (a pollutant), when present in air, in preference to oxygen to form a relatively stable compound called carboxyhaemoglobine, and this may lead to asphyxiation because of low blood level of oxygen.ir pollutants such as acid rains, ozone, heavy metals (such as lead, copper and cadmium) have been implicated plants yield, plants damage, and forest decline. Asthma, a form of difficult or heavy breathing caused by spasms of smooth (involuntary) muscles in the wall of the bronchioles, emphysema, caused by gradual breakdown of the thin walls of the alveoli; and bronchitis are caused by one or more pollutants, including pollens, household dusts, cigarette smoke, gases from exhaust pipes and in-