Effect of New York City Taxi Strike on CO Concentrations in Midtown Manhattan

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Abstract
Medallion taxicabs account for a significant fraction of the vehicle miles traveled (VMT) and concomitant total carbon monoxide (CO) emissions in midtown Manhattan. During the period December 6 to December 20,1970, the medallion taxicabs were not operating in New York City because of a strike of the medallion taxicab operators. The strike period, albeit unintentionally, provided an experiment to evaluate the effect of a reduction in VMT on the ambient CO concentrations in a congested central city area. Furthermore, analysis of the CO measurements, traffic counts, and meteorological data before, during, and after the strike would provide an unusual test of models used to predict the relationship between CO emissions and CO concentrations at central city locations. This paper reports an analysis of the relationship between CO concentrations observed at a mid-Manhattan monitoring site, traffic counts, and wind speed measurements before, during, and after the 1970 New York City taxicab strike.

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