Abstract
A method is suggested for determining the mass concentration of airborne particles with sizes ≤1, ≤2.5, ≤10, and >10 μm by measuring the light scattering coefficients of the investigated air at the wavelengths λ1 ≤ 0.55 and λ2 ≥ 1.0 μm for the scattering angles θ1 ≤ 5° and θ2 = 15–45°. Mass concentrations of airborne particles are calculated on the basis of their stable statistical relationships with measured coefficients. Analytical expressions for approximation of these statistical relationships have been derived on the basis of an optical-microphysical model of urban aerosol, adopted by the World Meteorological Organization, with variable concentrations, size distribution parameters, and complex refractive index of the particles of aerosol components (soot, water-soluble, and dust). Statistical relationships derived in the modeling approach have been compared with independent numerical and experimental data. The errors of the method developed have been assessed under the overall variability of urban aerosol microphysical parameters.
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