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Total brake-specific PM2.5 emissions (whole bar) and EC component (lower portion of bar). (a) 1.7 L engine at three load conditions under 2002 calibration; (b) 6.4 L engine at two load conditions under 2004 calibration and at one load condition under 2007 calibration (bars C and D, brake-specific PM2.5 emissions were below 1 mg/kWh; and brake-specific EC emissions were below the method detection limit).
