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East Asia is a densely populated region with a myriad of primaryemissions of pollutants such as black carbon (BC) and carbonmonoxide (CO). To characterize primary emissions over the easterncoast of China, a series of field campaigns were conducted in 2011,including measurements from a ship cruise, island, and coastalreceptor sites. The relationship between BC and CO is presented herefor the first ship cruise (C1), the second ship cruise (C2), anisland site (Changdao Island, CD), and a coastal site (Wenling,WL). The average BC mass concentrations were 2.43, 2.73, 1.09, 0.94,and 0.77 µg m<sup>−3</sup> for CD, WL, C1-YS (Yellow Sea),C1-ES (East China Sea), and C2-ES, respectively. For thoselocations, the average CO mixing ratios were 0.55, 0.48, 0.31, 0.36,and 0.27 ppm. The high loadings of both BC and CO implysevere anthropogenic pollution over the eastern coast ofChina. Additionally, the linear correlation between BC and CO wasregressed for each location. The slopes, i.e., the ratios of ΔBC to ΔCO derived from their relationship,correlated well with the ratios of diesel consumption togasoline consumption in each province/city, which revealsvehicular emission to be the common source for BC and CO and that there aredistinct fuel structures between North and South China. The ΔBC/ΔCO values at coastal sites (Changdao Islandand Wenling) were much higher than those over the Yellow Sea and EastChina Sea, and the correlation coefficients also showed a decreasingtrend from the coast to the sea. Therefore, the quantity of ΔBC/ΔCO and the correlation coefficients are possibleindicators for the aging and removal of BC

The variability in the relationship between black carbon and carbon monoxide over the eastern coast of China: BC aging during transport