## 3 Results
### Quantitative Results
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**References** & **Title** & **Journal** & **Year** & **Citation** & **County** & **Type of Study** & **Environment** \\ \hline \multirow{3}{*}{[PERSON] et al. [11]} & Passenger comfort and ozone & Environmental & & & & & & \\  & pollution exposure in an & Monitoring and & 2020 & 0 & China & Experimental and & Passengers’ cabins \\  & air-conditioned bus & Assessment & & & & & & \\  & microenvironment & & & & & & \\ \hline \multirow{3}{*}{[PERSON] [48]} & Investigation of thermal & & & & & & & \\  & comfort for bus passengers & & & & & & \\  & during a cooling test inside a & & & & & & \\  & climatic chamber & & & & & & \\ \hline \multirow{3}{*}{[PERSON], [PERSON], and  [PERSON] [9]} & Numerical investigation of & & & & & & \\  & airflow patterns and thermal & & & & & & \\  & comfort in a bus cabin & & & & & & \\ \hline \multirow{3}{*}{[PERSON] et al. [13]} & The threshold effects of bus & & & & & & \\  & micro-environmental & & & & & & \\  & exposures on passengers’ & & D-Transport and & & & & \\  & momentary mood & & Environment & & & & \\ \hline \multirow{3}{*}{[PERSON]  et al. [18]} & Climate conditions and & & & & & & \\  & work-related fatigue among & & & & & & \\  & professional drivers & & & & & & \\ \hline \multirow{3}{*}{[PERSON] et al. [14]} & Air quality and passenger & & & & & & \\  & comfort in an air-conditioned & & & & & & \\  & bus micro-environment & & & & & \\ \hline \multirow{3}{*}{[PERSON] and [PERSON] [15]} & Optimal bus temperature for & & & & & & \\  & thermal comfort during a cool & & & & & & \\  & day & & & & & \\ \hline \multirow{3}{*}{[PERSON] [49]} & An experimental study on a & & & & & & \\  & bus air conditioner to & & & & & & \\ \cline{1-1}  & determine its conformity to & & & & & \\ \cline{1-1}  & design and comfort & & & & & & \\ \cline{1-1}  & conditions & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Papers included in this review. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**References** & **Title** & **Journal** & **Year** & **Citation** & **County** & **Type of Study** & **Environment** \\ \hline \multirow{4}{*}{[PERSON] and [PERSON] [31]} & An investigation of thermal comfort inside a bus during heating period within a climatic chamber & Applied Ergonomics & 2015 & 34 & Turkey & Experimental & Passengers’ cabins \\ \hline \multirow{4}{*}{[PERSON] and [PERSON] [50]} & Thermal discomfort and hypertension in bus drivers & & & & & & \\  & and charges in the metropolitan region of Belo & & & & & & \\  & Horizonte, Brazil & & & & & & \\ \hline \multirow{4}{*}{[PERSON] et al. [19]} & Relationship between thermal comfort and driving performance among Malaysian bus driver & ARPN Journal of Engineering and Applied Sciences & 2015 & 3 & Malaysia & Field & Drivers’ cabins \\ \hline \multirow{4}{*}{[PERSON] et al. [51]} & A descriptive analysis of factors contributing to bus drivers’ performances while driving a case study in Malaysia & International Journal of Automotive and Mechanical Engineering & 2015 & 16 & Malaysia & Field & Drivers’ cabins \\ \hline \multirow{4}{*}{[PERSON], [PERSON], and [PERSON] [52]} & Voice complaints among public transport workers in the metropolitan region of Belo Horizonte, Brazil & Folia Phoniatrica et Logopaedica & 2014 & 1 & Brazil & Field & Drivers’ and charges’ cabins \\ \hline \multirow{4}{*}{[PERSON], [PERSON], and [PERSON] [5]} & Evaluating bus transit performance of Chinese cities: developing an overall bus comfort model & Transportation Research Part A: Policy and Practice & 2014 & 22 & China & Field & Passengers’ cabins \\ \hline \multirow{4}{*}{[PERSON] [10]} & Indoor climate analysis for urban mobility buses: a CFD model for the evaluation of thermal comfort & International Journal of Environmental Protection and Policy & 2013 & 10 & Italy & Experimental and field & Passengers’ cabins \\ \hline \hline \end{tabular}
\end{table} 
Table 4: _Cont._