Question

Given the fact that most of us spend over 90% of our time indoors, it is most important to recognise that the air we breathe in at home or in offices can be polluted. It can be a cause of ill-health. Air pollutants, that are generally present in very low concentrations, can assume significance in closed ill-ventilated places. There can be several sources of indoor air pollution. Tobacco smoke is one of the most important air pollutants in closed places. "Passive smoking" or environmental tobacco smoke (ETS) pollution can cause non-smoking people to have all the harmful effects of tobacco smoking. ETS as a health hazard has been unequivocally proven and is also getting social recognition now. The children of smoking parents are among the worst affected persons. The next most important source of indoor air pollution is the allergens. House dust mites (HDM) are very small insects not visible to the naked eye and are the commonest source of allergy in the house. They are ubiquitous and thrive in a warm and moist atmosphere. Modem houses present ample breeding spaces for them in the form of carpets, curtains, mattresses, pillows, etc. Pets form an important part of life for some of us. But they can add plenty of allergens to our indoor atmosphere. Cats are notorious for doing this. Fine particles from feline fur can remain stuck to the upholstery and carpets for a long time even after the removal of the animal and lead to the worsening of asthma and skin allergies. Dogs can also be as troublesome. Toxic gases can also pollute the indoor environment. Biomass fuels (wood, cow dung, dried plants) and coal, if burned inside, can lead to severe contamination by carbon monoxide (CO): The poor quality of stoves and other cooking or heating appliances that cause incomplete combustion of LPG can also lead to the emission of CO or nitrogen dioxide. Formaldehyde (a gas) can be released from adhesives that are used for fixing carpets, upholstery and also in making plywood and particleboard. It is important to realise that the air we breathe at home may not always be clean and we must try to eliminate the source of pollution. We should give due consideration to venulation.
make a summary of the above passage?
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Answer 1

Answer:

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Explanation: