## 7 Summary of MIR Gas Sensing
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Species** & **Bands** & **Wavelength/nm** & **Laser Type** & **Techniques** & **LOD 1/ppb** & **Refs** & **Applications** \\ \hline CH\({}_{3}\)OH & \(v_{9}\) & 3390 & OPO & FCS & 40830 s & [210] & Technique research \\ \hline C\({}_{2}\)H\({}_{5}\)OH & / & 3367 & OPO & FCS & 40830 s & [210] & Technique research \\ \hline \multirow{4}{*}{CH\({}_{3}\)COCH\({}_{3}\)} & \multirow{2}{*}{\(v_{9}\)} & 3380 & VECSEL 9  & DAS & 130800 s & [217] & Breath VOCs detection \\ \cline{2-7}  & & 3389.8 & OPO & FCS & 9.16\%30 s & [210] & Technique research \\ \cline{2-7}  & & & & & & \\ \cline{2-7}  & & & & & & & \\ \cline{2-7}  & & & & & & & \\ \cline{2-7}  & & & & & & & \\ \cline{2-7}  & & & & & & & \\ \hline \multirow{4}{*}{CO\({}_{2}\)} & \multirow{4}{*}{\(v_{3}\)} & 4330 & OPO & DIAL 10  & 1.2 \(\times\) 10  & Atmospheric research \\ \cline{2-7}  & & 4330 & QCL & \begin{tabular}{c} I-QEPAS \\ 11 \\ \end{tabular} & 300 ppt@4 s & [218] & Technique research \\ \cline{2-7}  & & 4200 & ICL & DAS & \begin{tabular}{c} \(5\times 10^{4}\) \\ / \\ \end{tabular} & [72] & Combustion diagnose \\ \cline{2-7}  & & 4172 & ICL & \begin{tabular}{c} WMS \\ 900.07 s \\ \end{tabular} & [71] & \begin{tabular}{c} Exhaled breath \\ analysis \\ \end{tabular} \\ \hline \multirow{4}{*}{CO} & \multirow{4}{*}{\(v_{1}\)} & 4691.2 & ICL & \begin{tabular}{c} WMS \\ 900.07 s \\ \end{tabular} & [71] & \begin{tabular}{c} Exhaled breath \\ analysis \\ \end{tabular} \\ \cline{2-7}  & & 4600 & & DAS & 500\%14 s & [220] & Atmospheric \\ \cline{2-7}  & & 4764 & QCL & \begin{tabular}{c} WMS \\ \end{tabular} & 26\%1 s & [221] & Indoor air \\ \cline{2-7}  & & 4980 & & WMS & / & [222] & Combustion diagnose \\ \hline \multirow{4}{*}{NO} & \multirow{4}{*}{\(v_{1}\)} & 5184 & ICL & DAS & \(3\times 10^{4}\)@10 ms & [223] & Combustion emission \\ \cline{2-7}  & & 5200 & & QEPAS 12  & 120 & [224] & Engine exhaust monitoring \\ \cline{2-7}  & & 5250 & & WMS-2f & / & [225] & Technique research \\ \cline{2-7}  & & 5030 & & DAS & / & [226] & Gas sensing in high temperature \\ \cline{2-7}  & & 5263 & & \begin{tabular}{c} I-QEPAS; \\ WMS-2f \\ \end{tabular} & 4.8\%30 ms & [227] & Environmental \\ \hline \multirow{2}{*}{NO\({}_{2}\)} & \multirow{2}{*}{\(v_{3}\)} & 6250 & QCL & WMS & \begin{tabular}{c} 360 (600 K); \\ 760 (800 K) \\ \end{tabular} & [228] & \begin{tabular}{c} Gas sensing in \\ high temperature \\ \end{tabular} \\ \cline{2-7}  & & \(v_{1}+v_{3}\) & 3250–3550 & OPO & PAS & 14\%170 s & [3] & Environmental \\ \hline \multirow{4}{*}{N\({}_{2}\)O} & \multirow{2}{*}{\(v_{3}\)} & 7782 & ECQCL & DAS & \(7.36\times 10^{3}\) & [229] & \begin{tabular}{c} Toxic industrial \\ chemical \\ detection \\ \end{tabular} \\ \cline{2-7}  & & \(v_{2}\) & 8600 & QCL/DFG & FCS & 0.3 & [230] & Atmospheric \\ \cline{2-7}  & & \(v_{1}\) & 4530 & QCL & CLaDS & \(1.2\times 10^{3}\) & [231] & Atmospheric \\ \hline \multirow{4}{*}{NH\({}_{3}\)} & \multirow{4}{*}{\(v_{2}\)} & 10,400 & ECQCL & PAS & 1 & [49] & Atmospheric research \\ \cline{2-7}  & & 10,340 & & QEPAS, & 661 s & [232] & \begin{tabular}{c} Exhaled breath \\ analysis \\ \end{tabular} \\ \cline{2-7}  & & 9560 & & DAS & 17.3\%3 s & [233] & Atmospheric \\ \cline{2-7}  & & 9060 & & WMS & 0.3 & [2] & Atmospheric \\ \cline{2-7}  & & \(v_{1}\) & 2958.5 & OPO & FCS & 25630 s & [210] & \
\begin{tabular}{c} Exhaled breath \\ analysis \\ \end{tabular} \\ \hline \multirow{2}{*}{N\({}_{2}\)H\({}_{4}\)} & \multirow{2}{*}{\(v_{12}\)} & 10,363 & LD & DAS & 400 & [234] &
\begin{tabular}{c} Chemical \\ analysis \\ \end{tabular} \\ \hline \multirow{2}{*}{O\({}_{3}\)} & \multirow{2}{*}{\(v_{3}\)} & 9697 & QCL & DIAS 13  & 300 & [235] & Atmospheric \\ \cline{2-7}  & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Cont.