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. Reducing black carbon (BC) emissions has been recognized as anefficient way to simultaneously improve air quality and mitigate climatechange. However, the benefits of BC emission controls are not wellquantified,partly due to a lack of understanding of the changes in BC light absorptionas a result of emission reductions. In this work, we discuss the effects ofmulti-pollutant emission reductions on BC light absorption based on afield campaign study conducted before, during and after the 2014 APEC(Asia-Pacific Economic Cooperation) meeting in Beijing, China. When emissionrestrictions were in place during APEC, we found that the reduction in thelight absorption of BC-containing particles was driven by both the decreasein BC mass concentration and the weakened light-absorption capability of BC.Compared with that before and after APEC, the daytime light absorption ofBC-containing particles during APEC was reduced by ∼56  %, of which ∼48 % was contributed by the decrease in BC mass concentration and theremaining ∼8  % was contributed by a weakening of light-absorptioncapability for BC. Based on single-particle soot photometer (SP2)measurementsand Mie calculations, we estimated that the light-absorption capability ofBC-containing particles with ∼80 –200 nm refractory BC (rBC) cores indaytime during APEC was reduced by ∼6 –15 % and ∼10 –20 %compared with those before and after APEC, respectively. The decrease in BClight-absorption capability could be attributed to less coating material onBC surfaces as a result of the decreased chemical production of secondaryaerosols. Compared with that before and after APEC, the mass ratio betweenthe coating materials and rBC core ( ∼80 –200 nm) during APEC decreasedby ∼10 –30 % and ∼31 –53 %, respectively, due to reductions incoating precursor emissions, e.g., SO2 and NO2 . Theresults reveal the benefits of emission control on BC light absorption bysimultaneously reducing the mass concentration and light-absorptioncapability of BC, implying that synergetic reduction in multiple-pollutantemissions could benefit both air quality and climate.

Reduction in black carbon light absorption due to multi-pollutant emission control during APEC China 2014