## 3 Results
### Publications
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Title** & **Journal** & **Author/Year of Publication** & **Wos Citations/Average by Year** & **Pollutants Investigated** & **Exercise/Sport Context** \\ \hline Asthma in exercising children exposed to ozone: a cohort study & Lancet & [PERSON] et al. (2002)[26] & 462 / 24.32 & PM\({}_{10}\), PM\({}_{2.5}\), O\({}_{3}\), NO\({}_{2}\) & Sports \\ Quantifying the air pollutants emission reduction during the 2008 Olympic Games & Environmental Science \& Technology & [PERSON] et al. (2010)[27] & 215 / 19.55 & SO\({}_{2}\), NO\({}_{2}\), PM\({}_{10}\), NMVC & The 2008 Olympic Games \\ The health risks and benefits of cycling in urban environments compared with car use: health impact assessment study & British Medical & [PERSON] et al. (2011)[28] & 203 / 20.30 & PM\({}_{2.5}\) & Transport—cyclism \\ Association Between Changes in Air Pollution Levels During the Beijing & Journal of the American Medical & [PERSON] et al. (2012)[29] & 195 / 21.67 & PM\({}_{2.5}\), SO\({}_{2}\), NO\({}_{2}\) CO, O\({}_{3}\) & The 2008 Olympic Games \\ Olympics and Homakers of Inflammation & Association & Association & & & \\ Exposure to particulate matter in traffic: A & Atmospheric comparison of cyclists and car passengers & Environment & [PERSON] et al. (2010)[30] & 185 / 16.82 & PNC, PM2.5 and PM10 & Transport—cyclism \\ Atmospheric Stratelative Matter/Platform & Environmental & & & & \\ During the 2008 Beijing Olympics & Science \& Technology & & & \\ Assessment of traffic-related air pollution in urban streets before and during the 2008 & Atmospheric & & & & \\ \hline Beijing Olympic Games traffic control period & Environment & & & & \\ Healthy neighborhoods: Walkibility and air pollution & Environmental Health Perspectives & [PERSON] et al. (2009)[33] & 97 / 8.08 & NO, O\({}_{3}\) & Physical activity \\ Subclinical responses in healthy cyclists & Environmental Health & [PERSON] et al. (2010)[34] & 87 / 7.91 & PM\({}_{10}\), PM\({}_{2.5}\), UFP & Transport - cyclism \\  & pollution: An intervention study & Journal of the American Medical & [PERSON] et al. (1967)[35] & 79 / 1.46 & CO & Sport - Running \\ Oxidant Air Pollution and Athletic Performance & American Medical & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Publications with the highest number of citations in WoS. Regarding the exercise context, most studies were performed during sporting events (39), mainly related to the 2008 Olympic Games in Beijing, China. This was followed by physical activity (22), sports in general (22) such as football and cycling, physical activity during transport (10), exercise (11), physical education classes, and physical fitness tests. The main pollutants investigated were particulate matter with an aerodynamic diameter smaller than 10 (PM\({}_{10}\)) and PM\({}_{2.5}\), with 43 and 45 studies, respectively. Nitrogen dioxide (NO\({}_{2}\)) was investigated in 34 studies, followed by ozone (O\({}_{3}\)) in 29 studies, CO (23), SO\({}_{2}\) (19), black carbon (17), comfort parameters such as temperature (13) and humidity (8), NOx (5), benzene, PM\({}_{1}\), PM not specified, and wind speed in 3 studies each. The benzene, toluene, ethylbenzene and xylene (BTEX) and air were analyzed in two studies. Air quality index was analyzed in three studies, and the number of measured parameters ranged from one to eight. It was observed that 74 (69.8%) studies reported at least one funding agency, while 32 (30.2%) did not present any. Among the studies that presented financing information, 39 (36.7%) presented a financing agency, 15 (14.1%) presented two, ten (9.4%) had three agencies, and ten (9.4%) presented more than three agencies (Figure 5). Figure 4: Categories of Keywords. Among the 74 funded studies, 96 different funding agencies were reported. The National Natural Science Foundation of China was the agency that funded the largest number of studies, funding eleven studies in total (Table 3). The funding agencies had their headquarters in 17 countries.