The nationwide lockdown inflicted by the global COVID-19 disease epidemic and imposed during 57 days in France was not immune to fluctuations in atmospheric pollutant concentrations. A whole range of human activities has been suspended Monday 17 March 2020 in all French regions. Since then experiments are progressing to reflect the effectiveness of reduced emissions. In this paper, we looked at variations of pollutants prior to, during and after containment period. In a first step, we proved through experiments on eight air pollutants, how all daily maximum pollutants concentration have decreased during containment phase, apart from the ozone pollutant O3. This Ozone pollutant has indeed increased by 27.19% during lockdown period and kept growing by 21.35% as well right after deconfinement. Indeed, the maximum daily concentrations detected in different regions of France, have decreased by 18.18%, 37.14%, 20.36%, 9.28%, 44.38%, 5.1% and 44.38%, respectively, for the pollutants SO2, NO2, CO, C6H6, NOX, PM2.5 and PM10. Declining levels of other pollutants, however, were not sustained after deconfinement for NO2, NOX and PM10. We have reinforced these findings by classifying each pollutant according to the ATMO and AQI indexes, to better visualize their criticality throughout the three lockdown phases (Pre/During/Post). The family of air pollutant variables with their associated geographical sources was thereafter exploited to justify their approximate contribution to the daily mortality rates associated to COVID-19 across all French regions. However, more thorough study is still in progress to validate this finding. Finally, coming up to the abrupt changes in airborne pollutants experienced in this period, a question about future climate crisis was raised again. Whereby a weighting study has shown the current and very short-term French scenario (Status-Quo) in view of its current environmental path, the political responses made towards future climate change crisis and French investments done in this sense.

中文翻译：

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封锁前/封锁期间和封锁后对法国主要空气污染物的环境影响

由全球 COVID-19 疾病流行造成并在法国实施了 57 天的全国封锁并不能免受大气污染物浓度波动的影响。2020 年 3 月 17 日星期一，法国所有地区的一系列人类活动都已暂停。从那时起，实验正在取得进展，以反映减少排放的有效性。在本文中，我们研究了遏制期之前、期间和之后的污染物变化。第一步，我们通过对八种空气污染物的实验证明，除了臭氧污染物 O3 之外，所有每日最大污染物浓度在遏制阶段是如何下降的。这种臭氧污染物在封锁期间确实增加了 27.19%，在解除封锁后也保持了 21.35% 的增长。确实，法国不同地区检测到的污染物 SO2、NO2、CO、C6H6、NOX 日最高浓度分别下降了 18.18%、37.14%、20.36%、9.28%、44.38%、5.1% 和 44.38%， PM2.5 和 PM10。然而，在 NO2、NOX 和 PM10 解除限制后，其他污染物水平的下降并未持续。我们通过根据 ATMO 和 AQI 指数对每种污染物进行分类来强化这些发现，以便更好地可视化它们在三个锁定阶段（前/期间/后）的关键性。此后，利用空气污染物变量族及其相关地理来源来证明它们对法国所有地区与 COVID-19 相关的每日死亡率的近似贡献是合理的。然而，更彻底的研究仍在进行中以验证这一发现。最后，面对这一时期空气污染物的突然变化，人们再次提出了未来气候危机的问题。一项加权研究显示了当前和非常短期的法国情景（现状），鉴于其当前的环境路径，对未来气候变化危机的政治反应以及法国在这个意义上所做的投资。