Keywords: difference-in-differences (DID)
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Journal Articles
Journal of Environmental Engineering and Science (2026) 21 (1): 58–71.
Published: 26 September 2025
... concentration and meteorological factors in the ETS pilot cities during the four seasons? Specifically, we aimed to quantitatively determine the influences of individual meteorological factors on PM2.5 levels. To address these questions, we used the difference-in-differences (DID) model to determine whether...

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