State Key Laboratory for Mesoscopic Physics and School of Physics;
Peking University;
Beijing 100871;
China;
Collaborative Innovation Center of Quantum Matter;
Beijing 100871;
China;
Collaborative Innovation Center of Extreme Optics;
Shanxi University;
Taiyuan 030006;
China;
Department of Electrical and Computer Engineering;
National University of Singapore;
Singapore 117583;
Singapore;
NUS Suzhou Research Institute(NUSRI);
Suzhou 215123;
China;
SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology;
Shenzhen University;
Shenzhen 518060;
China;
air pollution; optical nanofiber; single particulates; size spectrometer;