Addition/Correction pubs.acs.org/est
Correction to Verifying Emission Reductions from Heavy-Duty Diesel Trucks Operating on Southern California Freeways Kathleen H. Kozawa,* Seong Suk Park, Steven L. Mara, and Jorn D. Herner Environ. Sci. Technol. 2014, 48(3) 1475−1483; DOI: 10.1021/es4044177.
F
igure 2 of the research manuscript “Verifying emission reductions from heavy-duty diesel trucks operating on
Figure 2. Trends in HDDT fuel-based emission factors calculated for the I-710 freeway compared with SR-60 freeway measurements made in 2012 for (a) BC, (b) NOX, and (c) UFP. Error bars represent one standard deviation. Note: Error bars are not drawn for September 2010 UFP EF as only one data point was available.
southern California freeways” describes fleet-averaged, fuelbased emission factors for black carbon NOX and ultrafine particles (UFP). Unfortunately the units as described for UFP emissions factors (Figure 2c) is incorrect. The previous version indicated UFP emissions in units of “g kg−1 Fuel.” The correct units should be “particle number × 103 kg−1 Fuel. The corrected figure is included below. © 2014 American Chemical Society
Published: July 10, 2014 8933
dx.doi.org/10.1021/es502114e | Environ. Sci. Technol. 2014, 48, 8933−8933
