## 7 Summary of MIR Gas Sensing
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Species** & **Bands** & **Wavelength/nm** & **Laser Type** & **Techniques** & **LOD/ppb** & **Refs** & **Applications** \\ \hline CH\({}_{4}\)/N\({}_{2}\)O & \(v_{4}\)/\(v_{3}\) & 7800 & QCL & WMS-2f & \multicolumn{2}{c}{5.981 s} & [114] & Atmospheric \\ \hline \multirow{4}{*}{
\begin{tabular}{c} CH\({}_{4}\)/H\({}_{2}\)CO/C\({}_{2}\)H\({}_{4}\)/ \\ C\({}_{2}\)H\({}_{2}\)/CO \\ \end{tabular} } & \multirow{4}{*}{\(v_{3}\)/\(v_{1}\)/\(v_{11}\)/\(v_{3}\)/\(v_{1}\)} & \multirow{4}{*}{2500-5000} & \multirow{4}{*}{OPO} & \multirow{4}{*}{FCS} & 310 & \multirow{4}{*}{[251]} & \multirow{4}{*}{Technique research} \\ \cline{4-7}  & & & & & & 320 & & \\ \cline{4-7}  & & & & & & 110 & & \\ \cline{4-7}  & & & & & & 270 & & \\ \hline CH\({}_{4}\)/NO & \(v_{3}\)/\(v_{1}\) & 3000–5400 & DROPO & FCS & \multicolumn{2}{c}{20} & \multirow{4}{*}{[172]} & \multirow{4}{*}{[172]} & \multirow{4}{*}{Atmospheric} \\ \cline{4-7}  & & & & & & 2301 s & & \\ \cline{4-7}  & & & & & 6.581 s & & & \\ \cline{4-7}  & & & & & 6.2 \(\times\) 10\({}^{4}\)@1 s & & & \\ \hline CH\({}_{4}\)/N\({}_{2}\)O/H\({}_{2}\)O & \(v_{4}\)/\(v_{3}\)/\(v_{2}\) & 8000 & ECQCL & WMS-2f & \multicolumn{2}{c}{4.801 s} & [50] & Atmospheric \\ \cline{4-7}  & & & & & 3.1 \(\times\) 10\({}^{4}\)@1 s & & \\ \hline CH\({}_{3}\)OH/C\({}_{2}\)H\({}_{5}\)OH & \(v_{8}\) & 10,100 & ECQCL & DAS & \multicolumn{2}{c}{13001 s} & [146] & Atmospheric VOCs \\ \hline C\({}_{2}\)H\({}_{5}\)OH/(C\({}_{2}\)H\({}_{5}\))\({}_{2}\)O/ & / & 3800 & QCL & CRDS & \multicolumn{2}{c}{157} & \multirow{4}{*}{[18]} & Atmospheric VOCs \\ \cline{4-7}  & & & & 60 & & 60 & & \\ \cline{4-7}  & & & & 280 & & & \\ \hline CO\({}_{2}\)/CO & \(v_{3}\)/\(v_{1}\) & 4730 & EC-QCL & WMS-2f & \multicolumn{2}{c}{6.5 \(\times\) 10\({}^{5}\)} & [7] & Exhaled breath analysis \\ \hline CO\({}_{2}\)/CO & \(v_{3}\)/\(v_{1}\) & 4250 & QCL & WMS & \multicolumn{2}{c}{10\({}^{6}\)} & [51] & Combustion diagnose \\ \hline CO\({}_{2}\)/CO & \(v_{3}\)/\(v_{1}\) & 4193 & ICL & DAS & / & [253] & Combustion diagnose \\ \hline CO\({}_{2}\)/NO & \(v_{3}\)/\(v_{1}\) & 44979 & QCL & DAS & \multicolumn{2}{c}{2.7; 0.2} & [118] & Technique research \\ \hline CO\({}_{2}\)/N\({}_{2}\)O & \(v_{3}\)/\(v_{1}\) & 4466 & QCL & WMS & \multicolumn{2}{c}{4.301 s/} & \multirow{4}{*}{[147]} & \multirow{4}{*}{Combustion diagnose} \\ \cline{4-7}  & & & 2551 & LD & & & \(1.4\times 10^{7}\) & \\ \cline{4-7} H\({}_{2}\)O/CO\({}_{2}\)/CO & \(v_{3}\)/\(v_{1}\) & 4176 & ICL & WMS-2f/1f & \multicolumn{2}{c}{\(6\times 10^{6}\)} & \multirow{4}{*}{[147]} & \multirow{4}{*}{[147]} & \multirow{4}{*}{Combustion diagnose} \\ \cline{4-7}  & & & 4865 & QCL & & & \(4\times 10^{6}\) & \\ \hline NO/CO/ & \(v_{1}\) & 5263 & QCL & DAS & \multicolumn{2}{c}{0.501 s} & \multirow{4}{*}{[254]} & Exhaled breath analysis \\ \cline{4-7} N\({}_{2}\)O & \(v_{1}\) & 4566 & QCL & DAS & \multicolumn{2}{c}{0.801 s} & \multirow{4}{*}{[254]} & Exhaled breath analysis \\ \hline CO/N\({}_{2}\)O & \(v_{1}\) & 4500 & QCL & WMS & \multicolumn{2}{c}{0.36} & \multirow{2}{*}{[255]} & Atmospheric \\ \cline{4-7}  & & & & 0.15 & & & \\ \hline CO/N\({}_{2}\)O & \(v_{1}\) & 4610 & QCL & QEPAS & \multicolumn{2}{c}{0.09@5 s} & \multirow{4}{*}{[256]} & Atmospheric \\ \hline NO/NO\({}_{2}\) & \(v_{1}\)/\(v_{3}\) & 5263 & QCL & DAS & \multicolumn{2}{c}{597.301 s} & \multirow{4}{*}{[257]} & Atmospheric \\ \cline{4-7}  & & & 6135 & & & 438.301 s & \\ \hline NO/NO\({}_{2}\) & \(v_{1}\)/\(v_{3}\) & 5263 & QCL & FMS & \multicolumn{2}{c}{481 s} & \multirow{4}{*}{[258]} & Technique research \\ \cline{4-7}  & & & 6134 & & & 981 s & \\ \hline NO/NO\({}_{2}\) & \(v_{1}\)/\(v_{3}\) & 5263 & QCL & WMDM-2f 1 & \multicolumn{2}{c}{0.750100 s} & \multirow{4}{*}{[259]} & Atmospheric \\ \cline{4-7}  & & & 6134 & & & 0.90200 s & \\ \hline NO/NO\({}_{2}\) & \(v_{1}\)/\(v_{3}\) & 5263 & QCL & DAS & \multicolumn{2}{c}{1.50100 s} & \multirow{4}{*}{[260]} & Vehicle exhaust \\ \cline{4-7}  & & & 6250 & & & 0.50100 s & \\ \hline NO/NO\({}_{2}\) & \(v_{1}\)/\(v_{3}\) & 5250 & QCL & DAS & \multicolumn{2}{c}{1.50100 s} & \multirow{4}{*}{[261]} & Environmental monitoring \\ \hline \hline \end{tabular}
\end{table}