\begin{tabular}{l*{5}{c}} 
\\[-1.8ex]\hline \hline \\[-1.8ex]
                    &\multicolumn{1}{c}{Road}&\multicolumn{2}{c}{Annual fire activity}   &\multicolumn{2}{c}{Annual average PM 2.5}  \\\cmidrule(lr){2-2}\cmidrule(lr){3-4}\cmidrule(lr){5-6}
                    &\multicolumn{1}{c}{1st stage}&\multicolumn{1}{c}{RF}&\multicolumn{1}{c}{IV}&\multicolumn{1}{c}{RF}&\multicolumn{1}{c}{IV}\\
\midrule
Above threshold     &       0.230\sym{***}&       0.366\sym{**} &                     &       0.107\sym{**} &                     \\
                    &     (0.017)         &     (0.152)         &                     &     (0.045)         &                     \\
Road built          &                     &                     &       1.590\sym{**} &                     &       0.463\sym{**} \\
                    &                     &                     &     (0.667)         &                     &     (0.199)         \\
\midrule
Observations        &      133812         &      133788         &      133788         &      133788         &      133788         \\
Control group mean  &        0.26         &        2.77         &        2.77         &       42.59         &       42.59         \\
\hline \hline \\[-1.8ex] 
\multicolumn{6}{p{\linewidth}}{\small 
\noindent \textit{Note}: All models 
include baseline controls, 
district-threshold and year FE, and 
triangular kernel weights. Std.\ errors 
clustered at village level. 
* p$<$0.10, ** p$<$0.05, 
*** p$<$0.01.} 
\end{tabular}
