Air pollution in megacities has become a serious problem. Fine particles called PM2.5, with a diameter of 2.5 micrometres or less, are particularly problematic. Our observation site, located in eastern Osaka, is home to many smalland medium-scale manufacturing enterprises. A clear atmosphere is rare in this area, and the air is usually polluted with suspended particles emitted from diesel vehicles and industries. Furthermore, pollutants carried by winds from China add to the levels of pollution in the atmosphere. In this work, we investigate the size and composition of particulate matter with a scanning electron microscope (SEM) coupled with an energy-dispersive X-ray analyser (EDX). We use sampling data from an PM sampler mounted on the roof of a building at Kinki University at a height of about 50 m above sea level. It is evident that aerosol properties such as the amount, size, shape, and composition, change when anthropogenic or dust aerosol is transported. The level of sulphate and the percentage of fine particle increase in severe air pollution. In contrast, it is clear that silicon, which is possibly derived from soil particles, becomes dominant and that the number of large particles increase during the dust event.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Nakata, M. Nakata, I. Sano, I. Sano, S. Mukai, S. Mukai, "Measurements of PM2.5 in megacity", Proc. SPIE 8890, Remote Sensing of Clouds and the Atmosphere XVIII; and Optics in Atmospheric Propagation and Adaptive Systems XVI, 88900X (17 October 2013); doi: 10.1117/12.2028477; https://doi.org/10.1117/12.2028477


Time series MODIS satellite and in situ data for spatio...
Proceedings of SPIE (October 15 2015)
Cryogenic aerosol cleaning of photomasks
Proceedings of SPIE (June 27 2005)
Individual particle analysis in suburban Osaka
Proceedings of SPIE (November 01 2012)
Laser monitoring of the air pollution by aerosols
Proceedings of SPIE (December 08 2005)

Back to Top