data of acp-2022-250

The samples were separated at -30℃, after water was removed. Then the gas was determined by FID, after high temperature desorption (325℃) and column chromatographic separation. At the QP site, VOCs were determined by gas chromatography (GC5000 BTX/VOC, AMA, German) and a flame ionization detector (FID).

The samples were condensed low-carbon (C2-C6) compounds and high-carbon (C6-C12) compounds under the temperatures of 15℃ and 30℃, respectively. Then the gas was analyzed by FID after high temperature desorption (230℃) and column chromatographic separation. The R2 of all of the VOCs were ≥ 0.995.

The accuracy of 95 % of compounds was ≤ ± 20 %. The minimum detection limit (MDL) of most VOC components was ≤ 0.15 ppb. This data provide new insights into the accurate air-quality control at a city level in China due to a wide variety of land-use types, and highlight that the simultaneous multiple-site measurements in the megacity or city cluster could be more appropriate to fully understand the VOC characteristics relative to a single-site measurement performed normally.