Country Trends in Major Air Pollutants

The Country Trends in Major Air Pollutants data set is a framework of public-health-focused air quality indicators that quantifies over 200 countries' trends in exposure to Particulate Matter (PM2.5), Ozone (O3), Nitrogen Oxides (NOx), Sulfur Dioxide (SO2), Carbon Monoxide (CO), and Volatile Organic Compounds (VOCs). Pollutant concentration data are derived from the European Centre for Medium-Range Weather Forecasts (ECMWF) Atmospheric Composition Reanalysis 4 (EAC4) data sets, freely available from the Copernicus Atmospheric Monitoring Services' Atmospheric Data Store (https://ads.atmosphere.copernicus.eu). CIESIN's Gridded Population of the World, Version 4 (GPWv4): Population Count Adjusted to Match 2015 Revision of UN WPP Country Totals, Revision 11 was used in the population weighting algorithm.<br>

《全球主要大气污染物国别趋势数据集》是一套以公共卫生为导向的空气质量指标框架，量化了全球200余个国家在细颗粒物（Particulate Matter，PM2.5）、臭氧（Ozone，O3）、氮氧化物（Nitrogen Oxides，NOx）、二氧化硫（Sulfur Dioxide，SO2）、一氧化碳（Carbon Monoxide，CO）以及挥发性有机物（Volatile Organic Compounds，VOCs）暴露水平的变化趋势。
该数据集的污染物浓度数据源自欧洲中期天气预报中心（European Centre for Medium-Range Weather Forecasts，ECMWF）的大气成分再分析第4版（Atmospheric Composition Reanalysis 4，EAC4）数据集，可通过哥白尼大气监测服务大气数据存储库（https://ads.atmosphere.copernicus.eu）免费获取。
本次研究的人口加权算法采用了国际地球科学信息网络中心（Center for International Earth Science Information Network，CIESIN）发布的《世界栅格人口第4版（GPWv4）：经调整匹配联合国世界人口展望2015修订版国家总人口的人口计数》第11修订版数据。