Study reveals critical factors affecting urban pollution

signal management at intersections could help reduce levels of this pollutant."

Of course, simply reducing the use of cars in the city is also very valuable. Guldmann said that in an urban area with the average number of commuting workers (313,792 persons), if 20 percent of the workers were to reduce their work-trip distance by one mile, carbon monoxide would decrease by 0.8 parts per billion. This could be achieved by higher use of public transportation and by car pooling.

Preserving green space could also help, the study found. A 1 percent increase in the amount of agricultural land in the city led to a decrease of 0.07 percent in carbon monoxide levels.

"The statistical model we developed is not yet accurate enough to forecast pollution concentrations," Guldmann said. "However, we get a good look at the relative importance of different factors, so the results can help direct pollution control policy."


Contact: Jean-Michel Guldmann
Ohio State University

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