Extended Data Fig. 3: Sources of organic aerosol and their contribution to fine particle mass during the COVID lockdown period. | Nature Geoscience

Extended Data Fig. 3: Sources of organic aerosol and their contribution to fine particle mass during the COVID lockdown period.

From: Substantial contribution of transported emissions to organic aerosol in Beijing

Extended Data Fig. 3: Sources of organic aerosol and their contribution to fine particle mass during the COVID lockdown period.

Bulk chemical composition of particulate matter from an Aerosol Chemical Speciation Monitor and Aethalometer (ToF-ACSM and AE33, left) shows that roughly one-quarter of the particulate matter mass is organic without detailed information on the sources. Additional near-molecular information based on thermal desorption chemical ionization mass spectra (FIGAERO-CIMS, right) reveals that three-quarter of the organic aerosol is secondary, with a roughly equal contributions of biogenic SOA, aromatic-dominated-SOA, and aqueous SOA. The holes in the pie charts are constituents and sources not covered, which comprise less than 20%.

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