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the claim

Smog clears up on certain days due to changes in wind speed and atmospheric mixing height

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Smog clears up on certain days due to changes in wind speed and atmospheric mixing height?

Yes. Multiple studies demonstrate that meteorological factors such as wind speed and atmospheric mixing height (boundary layer height) play a critical role in the dispersion and removal of air pollutants, causing smog episodes to clear up when these factors increase.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

The retrieved literature consistently confirms that wind speed and atmospheric mixing height/boundary layer height are primary meteorological drivers responsible for the dispersion, dilution, and clearing of air pollutants and particulate matter (smog).

Evidence for · 4
Effect of wind speed on the level of particulate matter PM10 concentration in atmospheric air during winter season in vicinity of large combustion plant
2020
Confirmed that low wind speeds lead to higher particulate matter concentrations (smog episodes), while wind helps disperse them.
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Cichowicz, R., Wielgosiński, G., & Fetter, W. (2020). Effect of wind speed on the level of particulate matter PM10 concentration in atmospheric air during winter season in vicinity of large combustion plant. doi.org. https://doi.org/10.1007/s10874-020-09401-w

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More for · 3
Impact of synoptic meteorological conditions on air quality in three different case studies in Rome, Italy
2021
Demonstrates that natural removal of particulate matter is favored by intense winds and affected by the height of the mixing layer.
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Bernardino, A. D., Iannarelli, A., Casadio, S., Perrino, C., Barnaba, F., Tofful, L., Campanelli, M., Liberto, L. D., Mevi, G., Siani, A., & Cacciani, M. (2021). Impact of synoptic meteorological conditions on air quality in three different case studies in Rome, Italy. doi.org. https://doi.org/10.1016/J.APR.2021.02.019

Importance of Urban Green at Reduction of Particulate Matters in Sihwa Industrial Complex, Korea
2020
Shows that particulate matter reduction rates are related to increased atmospheric mixing height and active wind blowing.
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Yoo, S., Kim, T., Ham, S., Choi, S., & Park, C. (2020). Importance of Urban Green at Reduction of Particulate Matters in Sihwa Industrial Complex, Korea. doi.org. https://doi.org/10.3390/su12187647

Impact analysis of meteorological variables on PM2.5 pollution in the most polluted cities in China
2023
Identifies planetary boundary layer height and wind speed as key meteorological variables whose reduction leads to increased pollutant concentrations.
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Wang, J., Han, J., Li, T., Wu, T., & Fang, C. (2023). Impact analysis of meteorological variables on PM2.5 pollution in the most polluted cities in China. doi.org. https://doi.org/10.1016/j.heliyon.2023.e17609

What does the evidence say?

The retrieved literature consistently confirms that wind speed and atmospheric mixing height/boundary layer height are primary meteorological drivers responsible for the dispersion, dilution, and clearing of air pollutants and particulate matter (smog).

Receipt History
first checked05 Aug 2026
judged → SUPPORTED · 8705 Aug 2026
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