PAHs and NPAHs from 18 diesel trucks were tested in Beijing using a PEMS.
No significant reduction was observed for PAHs or NPAHs from diesel trucks with China 3 to 4 emission standards.
The gaseous-phase compounds had important contributions to the total PAHs and NPAHs.
Large gaps were found in the PAH and NPAH emissions from diesel vehicles when comparing the results of different studies.