Burridge Henry C, Bontitsopoulos Stavros, Brown Christopher, Carter Holly, Roberts Katherine, Vouriot Carolanne, Weston Dale, Mon-Williams Mark, Williams Natalie, Noakes Catherine
Imperial College London, Department of Civil and Environmental Engineering, Exhibition Rd, South Kensington, London SW7 2BX, UK.
University of Leeds, School of Civil Engineering, Woodhouse, Leeds LS2 9JT, UK.
J Build Eng. 2023 Jan 1;63:105459. doi: 10.1016/j.jobe.2022.105459. Epub 2022 Nov 15.
Seasonal changes in the measured CO levels at four schools are herein presented through a set of indoor air quality metrics that were gathered during the height of the COVID-19 pandemic in the UK. Data from non-intrusive environmental monitoring units were remotely collected throughout 2021 from 36 naturally ventilated classrooms at two primary schools and two secondary schools in England. Measurements were analysed to assess the indoor CO concentration and temperature . Relative to UK school air quality guidance, the CO levels within classrooms remained relatively low during periods of warmer weather, with elevated CO levels being evident during the colder seasons, indicating lower levels of per person ventilation during these colder periods. However, CO data from the cold period during the latter part of 2021, imply that the per person classroom ventilation levels were significantly lower than those achieved during a similarly cold weather period during the early part of the year. Given that the classroom architecture and usage remained unchanged, this finding suggests that changes in the ventilation behaviours within the classrooms may have altered, and raises questions as to what may have given rise to such change, in a year when, messaging and public concerns regarding COVID-19 varied within the UK. Significant variations were observed when contrasting data, both between schools, and between classrooms within the same school building; suggesting that work is required to understand and catalogue the existing ventilation provisions and architecture within UK classrooms, and that more work is required to ascertain the effects of classroom ventilation behaviours.
本文通过一组在英国新冠疫情高峰期收集的室内空气质量指标，展示了四所学校测得的一氧化碳（CO）水平的季节性变化。2021年全年，通过远程方式从英格兰两所小学和两所中学的36间自然通风教室收集了来自非侵入式环境监测装置的数据。对测量数据进行分析，以评估室内一氧化碳浓度和温度。相对于英国学校空气质量指南，在天气较暖和的时期，教室内的一氧化碳水平相对较低，而在较冷的季节，一氧化碳水平明显升高，这表明在这些较冷时期人均通风量较低。然而，2021年下半年寒冷时期的一氧化碳数据表明，人均教室通风水平明显低于当年年初类似寒冷天气期间的水平。鉴于教室的建筑结构和使用情况保持不变，这一发现表明教室内的通风行为可能发生了变化，并引发了关于在英国新冠疫情相关信息和公众关注度不断变化的这一年里，是什么导致了这种变化的疑问。在对比不同学校之间以及同一学校建筑内不同教室的数据时，观察到了显著差异；这表明需要开展工作来了解和梳理英国教室现有的通风设施和建筑结构，并且需要开展更多工作来确定教室通风行为的影响。
