Figure 1
From: “APEC Blue”: Secondary Aerosol Reductions from Emission Controls in Beijing
Aerosol particle composition before and during APEC.
Time series of aerosol species, including SOA, POA, sulfate, nitrate, ammonium, chloride and black carbon in PM1 at (A) 260 m and (B) the ground site. The pie charts present the average chemical composition of PM1 for five episodes as marked in the Figure and the numbers on the top of pie chart are the average total PM1 mass concentration in microgram per cubic meters. (C) shows the concentration ratio of each aerosol species between 260 m and the ground site during each episode. (D) shows the average difference in aerosol concentration for each episode compared to the average of all five episodes at 260 m and the ground site. The numbers show the percent change in each chemical species for the two episodes during the APEC.
