Short and long term exposure to NO2 can induce health effects. The health effects

related to the two types of exposure are often different in character. Short term

exposure to a very high NO2 concentration can result in severe pulmonary damage in

healthy humans. Exposures of persons with chronic lung diseases such as asthma and

chronic obstructive pulmonary disease(COPD) can cause short term responses such as

changes in lung function or airway responsiveness. Chronic (i.e. long term) exposure

to NO2 has been associated with increased respiratory symptoms, especially when

observed under indoor exposure. The methodologies are also generally quite different

for the study of acute reversible conditions and chronic health effects. Thus, it is

pertinent to separate effects occurring after short term and long term exposure in the

evaluation (Berglund et al. 1993). However, it should be realised that it is sometimes

difficult to determine whether observed health effects result from short or long term

exposure.

 

 

 

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