Nitrogen oxide and dioxide are toxic compounds emitted by motor vehicle engines. Nitrogen dioxide is a highly toxic gas which affects the respiratory system. In recent years studies have been conducted to determine the relationship between nitrogen dioxide concentrations and asthma incidence. Nitrogen dioxide concentrations can be taken as an index of air pollution by exhaust gases. The authors give account of the results of a study on NO₂ concentrations along one of Cracow main streets. Aleja Trzech Wieszczów.
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