Real time air quality observations

This dataset contains real time observations generated by the network of environmental air quality observation processes of the city of Santiago de Compostela, installed by the TRAFAIR project, funded by the Innovation and Networks Executive Agency (INEA) of the European Commission (EC), through its Connecting Europe Facility (CEF) program. The dataset contains one record for each air quality observation feature, i.e., each location where air quality is observed. Each such record includes metadata of the feature itself, the observed values and respective time instants, and references to the processes used to generate the observed values (provenance metadata). The metadata of the feature consists of identifiers, textual descriptions, and its geographic location. Two time instants are included in each record, the phenomenon time when the observed values apply to the feature location and the result time when the observations were generated (i.e. when the calibration model was applied to the raw voltage sensor data). For each pollutant, the record contains both its concentration measured in micrograms per cubic meter (ug/m3) and a reference to the process used to generate the value (provenance metadata). The following pollutants are observed: carbon monoxide (CO), nitrogen monoxide (NO), nitrogen dioxide (NO2) and ozone (O3). A coverage measure provides the percentage of raw data available to apply the calibration model, with respect to the total expected for the 10 minutes period. The dataset is updated every 10 minutes.

本数据集包含由圣地亚哥-德孔波斯特拉（Santiago de Compostela）城市环境空气质量观测网络生成的实时观测数据，该观测网络由欧盟委员会（European Commission, EC）创新与网络执行局（Innovation and Networks Executive Agency, INEA）通过其欧洲连接设施（Connecting Europe Facility, CEF）计划资助的TRAFAIR项目搭建。数据集针对每一项空气质量观测特征（即每一个空气质量监测点位）存储一条记录。每条记录包含该监测特征自身的元数据、观测值及对应时间戳，以及用于生成该观测值的处理流程引用（溯源元数据）。监测特征的元数据包括标识符、文本描述及其地理位置信息。每条记录包含两个时间戳：一是观测值适用于该监测点位的现象时间（phenomenon time），二是观测值生成时的结果时间（result time）——即针对原始电压传感器数据应用校准模型的时刻。针对每一种污染物，记录中既包含以微克每立方米（μg/m³）为单位的浓度测量值，也包含用于生成该值的处理流程引用（溯源元数据）。本次观测覆盖的污染物包括：一氧化碳（carbon monoxide, CO）、一氧化氮（nitrogen monoxide, NO）、二氧化氮（nitrogen dioxide, NO2）及臭氧（ozone, O3）。覆盖度指标用于表征针对10分钟观测周期的预期总原始数据中，可用于应用校准模型的原始数据占比。本数据集每10分钟更新一次。