Flutterby™! : 25% of cars

Plume-based analysis of vehicle fleet air pollutant emissions and the contribution from high emitters J. M. Wang, C.-H. Jeong, N. Zimmerman, R. M. Healy, D. K. Wang, F. Ke, and G. J. Evans:

The use of the plume-by-plume analysis enabled isolation of vehicle emissions, and the elucidation of co-emitted pollutants from similar vehicle types, variability of emissions across the fleet, and the relative contribution from heavy emitters. It was found that a small proportion of the fleet (< 25%) contributed significantly to total fleet emissions; 95, 93, 76, and 75% for black carbon, carbon monoxide, BTEX, and particle number, respectively. Emission factors of a single pollutant may help classify a vehicle as a high emitter. However, regulatory strategies to more efficiently target multi-pollutants mixtures may be better developed by considering the co-emitted pollutants as well.

Via Traffic emissions may pollute 1 in 3 Canadian homes and 25 Percent of Cars Cause 90 Percent of Air Pollution, Study Finds, by way of /.: 25 Percent of Cars Cause 90 Percent of Air Pollution.