Daily air quality observation coverage no max (2021-01)

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/本数据集提供了每种污染物（pollutant）的最大、最小及平均浓度估算值的逐日演变态势。本数据集依托TRAFair项目构建，项目网址为https://trafair.eu/