standards are more stringent. Some of the criteria pollutants, like carbon monoxide, are primary pollutants, which are emitted directly by identifiable sources. Others, like ozone, are secondary pollutants, which are formed by reactions in the atmosphere. And others, like particulates, are of mixed origin. Tobacco smoke has been identified as a key factor in North America and Europe in the development and progression of COPD. Numerous air pollutants in the home and workplace can be synergistic with one another and with genetic factors and respiratory infections to increase the incidence and severity of COPD. In developing nations, indoor air quality plays a large role in the development and progression of COPD. cause many respiratory diseases, both acute and chronic. Acute diseases include a range from mild irritations to inflammation to allergic reactions to impaired lung function to complete respiratory failure depending on the level of exposure. Chronic diseases include chronic obstructive pulmonary diseases ,
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