The Ministry of the Environment Government of Japan introduces HORIBA’s PM analyzer for improving to clarify PM 2.5 generation mechanism and source identification HORIBA Group recently delivered an order from the Ministry of the Environment of Japan (MOE Japan) for HORIBA’s PX-375 Continuous Particulate Monitor with X-ray Fluorescence, which continuously measures PM2.5’s fine particle matters in the air, while simultaneously analyzing its elements 24 hours a day. In April 2017, the monitor will be installed in the four MOE-designated locations of Tokyo, Niigata, Fukuoka, and Nagasaki, beginning continuous PM2.5 measurement and elemental analysis. Since the full picture regarding PM2.5, including the mechanism of its generation, remains undetermined, MOE Japan has strengthened its system to collect and analyze more data in order to clarify the cause of air pollution and take effective measures to reduce it. To that end, the Ministry has considered it as necessary to obtain large amounts of detailed, continuous data. PX-375 is capable of measuring not only the mass of PM2.5 using the amount of beta rays it absorbs but also elemental analysis through X-ray radiation, allowing users to understand the chemical components in PM2.5 generation. Therefore, the monitor enables collection of observation data that contributes to solve the problems related to air pollution.