Fig. 5: Van Krevelen diagram for CHN+ chromophores. | npj Climate and Atmospheric Science

Fig. 5: Van Krevelen diagram for CHN+ chromophores.

From: More water-soluble brown carbon after the residential “coal-to-gas” conversion measure in urban Beijing

Fig. 5

a, c Van Krevelen diagram for CHN+ chromophores in HULIS-BrC and WI-BrC fractions before (2015) the “coal-to-gas” conversion measure. b, d Similar to (a, c), but after (2019) the “coal-to-gas” conversion measure. The area of the circles is proportional to the fourth root of the intensity of individual chromophores, and the color bar denotes the aromaticity equivalent (black with XC < 2.5, red with 2.5 ≤ XC < 2.7, and blue with XC ≥ 2.7). The insert plot represents the chromophores identified only before or after the measure.

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