Seventy-five heavy-duty public transit buses, including different fuel systems (conventional diesel, natural gas and diesel hybrid), were tested on-road in Beijing using portable emission measurement systems. Second-by-second driving condition data were collected on typical urban bus routes...

Nitrogen oxides (NOX) emissions are creating significant air quality challenges in China’s megacities. Since Euro IV diesel buses equipped with selective catalyst reduction (SCR) systems failed to mitigate on-road NOX emissions as expected, real-world NOX emissions from newly introduced Euro V...