Urban Haze: The Extent of Automotive Contribution

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Science  12 Jan 1968:
Vol. 159, Issue 3811, pp. 192-194
DOI: 10.1126/science.159.3811.192


Observation of the correlation between nitrogen oxides and the extinction coefficient of atmospheric air suggests that the automobile exhaust aerosol (nonphotochemical) may be important to visibility in cities.