Cleaner Air from Massive Long-Distance Power Transmission Upgrade: Evidences from the UHV Grid’s PM2.5 Reduction Effects

1. Program files
do file.do generates all tables and regression results in the paper.
2.Data files
data and code.zip contains 4 data files and 1 do file.
full smaple data.dta is the source dataset used in this paper; this round of revisions excludes provinces that do not have UHV lines in 2020.
extended data.dta is supplemented with data from the 2020 UHV expansion line.
delete data.dta is the data after deleting the explanatory variables, missing values of the control variables, and preserving part of the empirical process in order to reproduce the results fluently.
enterp data.dta is the enterprise data used in this paper.
modelSAR.zip is all the data and code used for spatial metrology, and the .nb file is the mathematica scripts.
3.Data sources
The UHV project meta data was from the Annual Social Responsibility Report published by the China State Grid Corporation.
The pollution data was sourced from NASA satellite inversion data. Meteorological data for other variables were sourced from the daily data set of meteorological stations available on the National Meteorological Science Data Sharing Service Platform.
economic variables data was found in the China Urban Statistical Yearbook.
The firm-level data for mechanism study come from the China Industrial Enterprise Database.

1. 程序文件：
do文件（do file.do）可生成论文中的全部表格与回归结果。
2. 数据文件：
data and code.zip 内含4个数据文件与1个do文件。
full smaple data.dta 为本文所用的源数据集；本次修订剔除了2020年无特高压（Ultra High Voltage, UHV）线路的省份。
extended data.dta 补充了2020年特高压扩建线路的相关数据。
delete data.dta 为剔除了解释变量与控制变量缺失值后的数据集，且为保障实证结果可流畅复现保留了部分实证流程。
enterp data.dta 为本文所用的企业层面数据集。
modelSAR.zip 包含空间计量分析所需的全部数据与代码，其中.nb文件为Mathematica脚本文件。
3. 数据来源：
特高压项目元数据来源于国家电网公司（China State Grid Corporation）发布的年度社会责任报告。
污染数据来源于美国国家航空航天局（National Aeronautics and Space Administration, NASA）卫星反演数据。其余变量的气象数据来源于国家气象科学数据共享服务平台提供的气象站逐日数据集。
经济变量数据来源于《中国城市统计年鉴》。
机制分析所用的企业层面数据来源于《中国工业企业数据库》。