What the study found
The study found that ozone formation in the Guanzhong Basin shifted over the summer from VOCs-limited in early summer to transitional in midsummer and NOx-limited in late summer. It also found that secondary aerosol formation followed a different seasonal pattern, and that traffic and industrial emissions were the main human-related drivers for both ozone and secondary aerosols.
Why the authors say this matters
The authors conclude that understanding how ozone formation regimes and secondary aerosol formation regimes change over time and space is important for designing coordinated air-quality controls. They suggest that seasonally adaptive, city-specific management could improve control strategies in the Guanzhong Basin.
What the researchers tested
The researchers combined long-term near-surface observations from 2014–2024 with high-resolution WRF-Chem simulations for May to August 2022. They used scenario-based EKMA curves and source-apportionment diagnostics to examine formation regimes and sectoral contributions.
What worked and what didn't
Ozone formation showed a sub-seasonal progression: VOCs-limited in early summer, transitional in midsummer, and NOx-limited in late summer. The anthropogenic share of maximum daily 8-hour ozone increased from 32.8% in May to 55.2% in July, while the biogenic share peaked at 18.7% in July; traffic and industrial emissions were the dominant anthropogenic contributors. For secondary aerosols, the regime was NOx-limited in May, VOCs-limited in June, and transitional afterward.
What to keep in mind
The abstract focuses on the Guanzhong Basin and on the May–August period, so the findings are region- and season-specific. It does not describe limitations in detail beyond the scope of the data and simulations used.
Key points
- Ozone formation changed from VOCs-limited early in summer to NOx-limited late in summer.
- Secondary aerosol formation followed a different pattern: NOx-limited in May, VOCs-limited in June, then transitional.
- Anthropogenic contribution to maximum daily 8-hour ozone rose from 32.8% in May to 55.2% in July.
- Biogenic contribution to ozone peaked at 18.7% in July.
- Traffic and industrial emissions were the main anthropogenic drivers for both ozone and secondary aerosols.
Disclosure
- Research title:
- Ozone and secondary aerosol formation shifted across summer in Guanzhong basin
- Authors:
- Ruonan Wang, Ningning Zhang, Jiarui Wu, Qian Jiang, Jiaoyang Yu, Yuxuan Lu, XUEXI TIE
- Institutions:
- Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Institute of Earth Environment, Institute of Earth Environment, Institute of Earth Environment, Institute of Earth Environment, Institute of Earth Environment, Institute of Earth Environment, Institute of Earth Environment
- Publication date:
- 2026-03-05
- OpenAlex record:
- View
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