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- W4387107266 abstract "Comprehensive Air Quality Model with extensions (CAMx)–Decoupled Direct Method (DDM) simulations of first-order ozone (O3) sensitivity to nitrogen oxides (NOx) and volatile organic compounds (VOCs) emissions were performed and combined with modelled PH2O2/PHNO3 ratios to obtain a range of thresholds for determining O3-sensitivity regimes for different areas of China. Utilising the new threshold ranges for photochemical indicators, the method for determining O3 formation in the Ozone Source Apportionment Technology (OSAT) module within CAMx was improved by a dynamically varied threshold of PH2O2/PHNO3 ratio. The O3 concentration contributions in the newly added transition regime were apportioned to NOx and VOCs emissions in proportion to the relationship between the PH2O2/PHNO3 ratio and first-order O3 sensitivity. The source contributions of O3 concentrations from different emission sectors from June to September 2019 were compared using the original and improved CAMx-OSAT. The results showed that the O3 concentration contributions changed significantly in the NOx-limited regime, with a maximum decrease of 21.89%, while the contributions increased by up to 7.57% in the VOC-limited regime, and were within 15µg/m3 in the transition regime. The modified OSAT module enabled a more sophisticated attribution of O3 to precursor emissions and may have far-reaching implications for informing O3 pollution control policy." @default.
- W4387107266 created "2023-09-28" @default.
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- W4387107266 date "2023-09-01" @default.
- W4387107266 modified "2023-10-11" @default.
- W4387107266 title "Improving photochemical indicators for attributing ozone sensitivities in source apportionment analysis" @default.
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- W4387107266 doi "https://doi.org/10.1016/j.jes.2023.09.025" @default.
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