Daily air quality observation coverage co min (2021-05)

The dataset provides the daily evolution of the estimation of the maximum, minimum and average concentrations of each pollulant. This dataset has been created in the context of the TRAFAIR project - https://trafair.eu/本数据集呈现了各类污染物的最大、最小及平均浓度估算值的逐日演变情况。本数据集是在TRAFAIR项目的框架下创建的，项目官方网址为https://trafair.eu/