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Aerosol composition and sources during the Chinese Spring Festival: fireworks, secondary aerosol, and holiday effects

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Figure 1. Time series of meteorological parameters (a) relative humidity (RH) and temperature (T ); (b) wind direction (WD) and wind speed (WS) at the height of 100 m; mass concentrations of (c) PM 2.5 and NR-PM 1 + BC and (d) submicron aerosol species
Figure 2. Correlation of PM 1 vs. PM 2.5 with the data segregated into three fireworks events (LNY, LFD, and LF) and non-fireworks periods (NFW)
Figure 3. Average chemical composition of PM 1 and OA from fireworks and background during three FW events.
Figure 4. (a) Average mass spectra (MS) of OA during the firework period of Lunar New Year (23:30, 9 February–03:30, 10 February) and the period of background (BG, 04:30–11:00, 10 February)
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