Dispersion Normalized PMF Provides Insights into the Significant Changes in Source Contributions to PM<sub>2.5</sub> after the COVID-19 Outbreak
Qili Dai, Baoshuang Liu, Xiaohui Bi, Jianhui Wu, Danni Liang, Yufen Zhang, Yinchang Feng, Philip K. Hopke
Abstract
source representing 50.5% of the mean mass. Fireworks and residential burning (32.0%), primary coal combustion emissions (13.3%), primary traffic emissions (2.1%), soil and aged sea salt (1.2%), and incinerator (0.9%) represent the other contributors. Traffic decreased dramatically (70%) compared to other sources. Soil and aged sea salt also decreased by 68%, likely from decreased traffic.
Topics & Concepts
ParticulatesEnvironmental scienceSea saltDilutionAtmospheric sciencesCoal combustion productsCombustionIncinerationEnvironmental chemistryEnvironmental engineeringAerosolMeteorologyChemistryGeographyWaste managementOrganic chemistryGeologyThermodynamicsEngineeringPhysicsAir Quality and Health ImpactsCOVID-19 impact on air qualityClimate Change and Health Impacts