Haze is the phenomenon of visibility degradation caused by extinction effects related to the physicochemical properties of atmospheric particulate matter (APM). Atmosphere heterogeneous reactions can alter the physicochemical properties of APM. Therefore, it is important to understand the atmospheric heterogeneous reactions of APM in order to reveal the cause of haze. Herein, the current situation, developmental trend, source, and composition of APM pollution in China are reviewed. Additionally, we introduce the reaction characteristics and key chemical processes of common inorganic, organic, and mixed pollutant gases on the surface of mineral particles. The effects of mineral particulate matter on aggregation, regulation, and catalysis in the formation of atmospheric aerosols and the synergistic reaction mechanism of SO2, NO2, O3, and VOCs on the surfaces of different mineral particles are summarized. The problems existing in the current research on heterogeneous reactions on the surfaces of mineral particles are also evaluated. This paper aims to gain a deep understanding of the mechanism of mineral particulate matter promoting the formation of secondary aerosols and attempts to provide theoretical support for effective haze control.

In this article, the determination of the speciation of cadmium in dustfall about Northern China towns with reliable analytical method is reported. The distribution of total Cd varies in different regions, among which Duoba town of Qinghai Province tops it with the Cd amount of 5.3921 µg/g. And that of Shuangta town, Hebei Province is 2.0256 µg/g and the rest distribution are rather low, with the distribution 0.6-1.5 µg/g. Seeing from the Cd's average content level, these speciations' percentage are as follows: exchangeable form of 0.1484 µg/g, carbonates of 0.2283 µg/g, organic combination of 0.1750 µg/g and residual of 0.9179 µg/g. Besides, mainly form is residual and of low Fe-Mn oxides.