Abstract
Recently, it is reported that the atmospheric pollution levels of particulate matter (PM) are not decreasing despite the
introduction of stricter vehicle emission regulations. Vehicle emission measurement under real driving conditions
(RDE) by a portable emissions measurement system (PEMS) is attracting attention. Miniaturization was important in
order to install such analyzers in a narrow space as well as high accuracy. A new on-board PM analyzer was developed
in order to match miniaturization requirement. High performance of the PEMS PM was ensured before RDE tests. RDE
measurement of light duty vehicles were performed by utilizing the PEMS PM.
