Air quality data (data stream B) — assessment areas 2021 (dataset)

Data stream B includes all information on the assessment areas — such as name, area code, demarcation, number of inhabitants, history, pollutants and protection objectives, extension of deadlines.数据流B（Data stream B）涵盖所有评估区域的相关信息，具体包括评估区域的名称、区域代码、划界范围、居民数量、历史沿革、污染物情况、保护目标及延期时限等内容。