“…The size distribution of particulate matter (PM) is a significant PM attribute and has previously been investigated (Linak et al, 2002;Zhang et al, 2012). It is important not only to understand its effects on human health, visibility impairment, climate change, and transformation processes during atmospheric transport, but also to contribute to the source apportionment researches (Racherla and Adams, 2006;Yang et al, 2007;Pan et al, 2013;Zhang et al, 2016;Bari and Kindzierski, 2016;Jia et al, 2018). Emissions from boilers have aroused great concern, as they not only produce gaseous pollutants, for instance, CO, CO2, NOx, and SO2 (Dios et al, 2013;Hussain and Luo, 2019), but also emit PM.…”