Unique ID for each city
City
Year
Comprehensive air pollution index (the higher the worse air quality)
Precipitation
Fuel Price Index
Number of Civil Automobiles
value added of industry
= 1 if the city implements China II
= 1 if the city implements China III
= 1 if the city implements China IV
Stages of standards (=0 if is China I, =1 if is China II, =2 if is China III, =3
Log of Number of Civil Automobiles
Log of Added value of industry
e[id_city,t]
rank of (year)    by id_city
id_city==2
id_city==3
id_city==4
id_city==5
id_city==6
id_city==7
id_city==8
id_city==9
id_city==10
id_city==11
id_city==12
id_city==13
id_city==14
id_city==15
id_city==16
id_city==17
id_city==18
id_city==19
id_city==20
id_city==21
id_city==22
id_city==23
id_city==24
id_city==25
id_city==26
id_city==27
id_city==28
id_city==29
id_city==30
id_city==31
id_city==32
id_city==33
id_city==34
id_city==35
id_city==36
id_city==37
id_city==38
id_city==39
id_city==40
id_city==41
id_city==42
id_city==43
id_city==44
id_city==45
(id_city==2)*year
(id_city==3)*year
(id_city==4)*year
(id_city==5)*year
(id_city==6)*year
(id_city==7)*year
(id_city==8)*year
(id_city==9)*year
(id_city==10)*year
(id_city==11)*year
(id_city==12)*year
(id_city==13)*year
(id_city==14)*year
(id_city==15)*year
(id_city==16)*year
(id_city==17)*year
(id_city==18)*year
(id_city==19)*year
(id_city==20)*year
(id_city==21)*year
(id_city==22)*year
(id_city==23)*year
(id_city==24)*year
(id_city==25)*year
(id_city==26)*year
(id_city==27)*year
(id_city==28)*year
(id_city==29)*year
(id_city==30)*year
(id_city==31)*year
(id_city==32)*year
(id_city==33)*year
(id_city==34)*year
(id_city==35)*year
(id_city==36)*year
(id_city==37)*year
(id_city==38)*year
(id_city==39)*year
(id_city==40)*year
(id_city==41)*year
(id_city==42)*year
(id_city==43)*year
(id_city==44)*year
(id_city==45)*year