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. 2021 Jun 9;114(7):437–439. doi: 10.1093/qjmed/hcab163

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© The Author(s) 2021. Published by Oxford University Press on behalf of the Association of Physicians.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Investigation of the implementation of public health measures in the Japan National Stadium at J. League YBC Levain CUP held on 4 January 2021. (a) CO₂ concentrations. (b) Analysis of the proportion of people wearing face masks using video with artificial intelligence. (c) Human flow analysis. The event was held with 24 219 spectators, which is less than a limited capacity of 50%. Figures (a–c) were created with modifications based on refs.⁴^,⁵ DW, time for drinking water.