Daily air quality observation coverage no2 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/本数据集涵盖了各类污染物的最大、最小及平均浓度估算值的逐日变化趋势。本数据集是在TRAFair项目（https://trafair.eu/）的框架下研发构建的。