Volume 11 Issue 4 ( December 2024)

Particulate matter (PM) is a crucial component of air pollution found in both indoor and outdoor (ambient) environments. PM not only poses a risk to human health and driving safety but also plays a role in the transmission of Covid-19. In this study, we propose a novel approach-the Mie scattering method-to estimate the PM diameter. This method involves the scattering of laser light on spherical particles at various angles, providing a unique perspective on PM analysis. The results of our research simulations demonstrate a direct correlation between the scattering angle and the scattered light-to-illumination intensity ratio. We also observed that varying particle diameter leads to changes in I_S/I₀ . In our experiment, we varied the particle diameter from 0.2 to 0.5 μm, aligning with the general atmospheric pollution conditions PM2.5. Analysis of the I_S/I₀ ratio at certain scattering angles and wavelengths can be used to estimate the diameter of light-scattering spherical particles. The I_S/I₀ value increases as the particle size increases. Varying wavelength values affect changes in I_S/I₀ ; as the wavelength increases, the I_S/I₀ value becomes lower. The simulation results conclude that the optimal angle for scattering observations is between angles 0⁰ and 40⁰ .

Keywords: Particulate-Matter diameter; Air Pollution; Mie Scattering; Laser Light; Scattered Light; Wavelength; Scattering Angle