Extended Data Fig. 7: Current O3 photochemical regimes and future shifts. | Nature Cities

Extended Data Fig. 7: Current O3 photochemical regimes and future shifts.

From: Urban meteorology–chemistry coupling in compound heat–ozone extremes

Extended Data Fig. 7: Current O3 photochemical regimes and future shifts.The alternative text for this image may have been generated using AI.

a, Spatial distribution of O3 formation regimes derived from satellite-based HCHO/NO2 ratio (FNR) during May–August over 2020–2023. b, c, Surface FNR distribution during the warm season under (b) 2060 Baseline scenario and (c) 2060 On-time peak-net zero-clean air scenario. d, Vertical profile of O3 formation regimes in the four Chinese city clusters (NCP, YRD, SCB, PRD) by 2060 under different emission scenarios. FNR values are presented as mean ± 50% standard deviation. The O3 photochemical regimes were identified using the FNR threshold (2.2–3.2).

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