Study on the relationship between PM2.5 concentration and visibility in Beijing based on light scattering theory

YuFeng Yang; Ting Li

doi:10.1117/12.2309478

20 February 2018 Study on the relationship between PM2.5 concentration and visibility in Beijing based on light scattering theory

YuFeng Yang, Ting Li

Author Affiliations +

Proceedings Volume 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application; 106970O (2018) https://doi.org/10.1117/12.2309478
Event: Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 2017, Nanjing, China

Abstract

The study of the relationship between transmittance visibility and PM2.5 concentration under the haze conditions has important theoretical significance for Free Space Optical communication (FSO). In this paper, the influence of PM2.5 concentration on the transmittance, attenuation coefficient and visibility was studied by light scattering theory, and the results by Mie theory and Monte Carlo method were analyzed. At the same time, the effect of PM2.5 particle size distribution on visibility was also analyzed, and the visibility calculated by light scattering method was compared with the visibility measured in Beijing from 2014 to 2016. The result shows that the higher PM2.5 concentration is，the more obvious the multiple scattering effect is. When the mass concentration of PM2.5 is constant, the larger the geometric mean of the particle diameter is, the larger the visibility is. By comparing the visibility measured and the visibility calculated, we can see that when PM2.5 concentration is higher than 100μg/m³ , PM2.5 is the main factor affecting the visibility; and when PM2.5 concentration is lower than 100μg/m³, other factors (such as PM10, wind speed, air pressure and gas molecules) should also need to be considered.

Citation Download Citation

YuFeng Yang and Ting Li "Study on the relationship between PM2.5 concentration and visibility in Beijing based on light scattering theory", Proc. SPIE 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 106970O (20 February 2018); https://doi.org/10.1117/12.2309478

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