Individual Identifier
Year of Observation (1991-2007)
Province Name
Total Provincial Population (10000 persons)
total SO2 (kg)
Provincial GDP (100m Yuan)
Variable for time (coded as 1,2,3,4,etc)
Two Control Zone policy, equal to 1 once policy implemented
province area
Equal to 1 if ever received treatment
total SO2 emissions divided by total population
total SO2 emissions divided by total GDP
total GDP divided by total population
total GDP divided by total population, squared
Population Density, Numbers of people per km2