Potential for SARS-CoV-2 viral inactivation by solar UV radiation in outdoor spaces in the UK has been assessed. Average erythema effective and UV-A daily radiant exposures per month were higher (statistically significant, P < 0.05) in spring 2020 in comparison with spring 2015–2019 across most of the UK, while irradiance generally appeared to be in the normal expected range of 2015–2019. It was found that these higher radiant exposures may have increased the potential for SARS-CoV-2 viral inactivation outdoors in April and May 2020. Assessment of the 6-year period 2015–2020 in the UK found that for 50–60% of the year, that is most of October to March, solar UV is unlikely to have a significant (at least 90% inactivation) impact on viral inactivation outdoors. Minimum times to reach 90% and 99% inactivation in the UK are of the order of tens of minutes and of the order of hours, respectively. However, these times are best case scenarios and should be treated with caution.

中文翻译：

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2020 年春季高太阳紫外线辐射暴露对英国 SARS-CoV-2 病毒灭活的影响†

已经评估了英国室外空间中太阳紫外线辐射灭活 SARS-CoV-2 病毒的可能性。每月平均有效红斑和 UV-A 日辐射暴露量较高（统计学显着，P < 0.05) 在 2020 年春季与 2015-2019 年春季相比，英国大部分地区的辐照度通常似乎在 2015-2019 年的正常预期范围内。研究发现，这些较高的辐射暴露可能增加了 2020 年 4 月和 2020 年 5 月户外 SARS-CoV-2 病毒灭活的可能性。对英国 2015-2020 年 6 年期间的评估发现，对于 50-60% 的年，即 10 月至 3 月的大部分时间，太阳紫外线不太可能对户外病毒的灭活产生显着（至少 90% 的灭活）影响。在英国，达到 90% 和 99% 灭活的最短时间分别为几十分钟和几小时。但是，这些时间是最好的情况，应谨慎对待。