Figure 2.
The network map generated using VOSviewer illustrates interrelated research themes centred on indoor air quality. The largest node, indoor air quality, connects with clusters including hotels and motels, hospitality industry, green buildings, and sustainable development. Other clusters focus on tobacco smoke, public health, and exposure. Keywords such as smoking, restaurants, and secondhand smoke link strongly with public health, while asthma, fragrance, and consumer products connect with health risks. The map shows cross-disciplinary research integrating environmental science, health, and hospitality management.Clustering of the IAQ in hospitality management literature: health and tobacco smoke concerns (green cluster); hospitality industry and infrastructures (red cluster); environmental pollution (blue cluster); consumer preferences (purple cluster)
Source: Authors’ own work on VOSviewer