Figure 1

Scatter plots of visibility (km) and PM concentration (μg m−3) for CPM and PM2.5 at the ICN, 2015–2018. The different colors represent different weather types: haze, dust, mist, fog, and others (RA, DZ, SN, and None).

Scatter plots of visibility (km) and PM concentration (μg m−3) for CPM and PM2.5 at the ICN, 2015–2018. The different colors represent different weather types: haze, dust, mist, fog, and others (RA, DZ, SN, and None).