Respiratory Medicine Department, Faculty of Medicine, University of Thessaly, BIOPOLIS, 41110 Larissa, Greece.
Department of Nursing, Faculty of Nursing, University of Thessaly, GAIOPOLIS, 41110 Larissa, Greece.
Int J Environ Res Public Health. 2021 Jun 23;18(13):6748. doi: 10.3390/ijerph18136748.
Responding to the coronavirus pandemic, Greece implemented the largest quarantine in its history. No data exist regarding its impact on PM pollution. We aimed to assess PM levels before, during, and after lockdown (7 March 2020-16 May 2020) in Volos, one of Greece's most polluted industrialized cities, and compare PM levels with those obtained during the same period last year. Meteorological conditions were examined as confounders.
The study period was discriminated into three phases (pre-lockdown: 7 March-9 March, lockdown: 10 March-4 May, and post-lockdown period: 5 May-16 May). A wireless sensors network was used to collect PM, temperature, relative humidity, rainfall, and wind speed data every 2 s.
The lockdown resulted in a significant drop of PM by 37.4% in 2020, compared to 2019 levels. The mean daily concentrations of PM exceeded the WHO's guideline value for 24-h mean levels of PM 35% of the study period. During the strictest lockdown (23 March to 4 May), the mean daily PM levels exceeded the standard 41% of the time. The transition from the pre-lockdown period into lockdown or post-lockdown periods was associated with lower PM concentrations.
A reduction in the mean daily PM concentration was found compared to 2019. Lockdown was not enough to avoid severe exceedances of air pollution in Volos.
为应对新冠病毒疫情，希腊实施了史上最大规模的隔离措施。目前尚无数据表明该措施对 PM 污染的影响。我们旨在评估历史名城沃洛斯在封锁期间（2020 年 3 月 7 日至 5 月 16 日）的 PM 水平，并将其与去年同期进行比较。同时检验了气象条件作为混杂因素的影响。
研究期间分为三个阶段（封锁前：3 月 7 日至 9 日；封锁期：3 月 10 日至 4 月 5 日；封锁后：5 月 5 日至 16 日）。利用无线传感器网络每 2 秒收集 PM、温度、相对湿度、降雨量和风速数据。
与 2019 年相比，2020 年封锁期间 PM 下降了 37.4%。在研究期间，PM 24 小时平均浓度有 35%超过世界卫生组织（WHO）指导值。在最严格的封锁期间（3 月 23 日至 4 月 5 日），PM 日均值超标达 41%。从封锁前到封锁期或封锁后过渡期间，PM 浓度较低。
与 2019 年相比，PM 日均值浓度有所下降。仅封锁措施不足以避免沃洛斯严重的空气污染超标。
