The concentration of PM2.5 suspended particles (particles with diameters up to 2.5 microns) shockingly can reach 1000 micrograms per cubic meter. That's at the level of a sandstorm.
懸浮微粒中 PM2.5 的濃度居然高達每立方公尺 1000 μ g，已相當於沙塵暴等級。