Figure 1.
The image presents a network diagram illustrating the relationships among various terms associated with indoor air quality. Central to the diagram is the term "indoor air quality," which is prominently displayed in large font. Surrounding it are connected nodes representing topics such as smoking, restaurants, hotels, public health, and environmental impacts. The size of each node varies, indicating the strength or relevance of the connections. Lines interconnecting the nodes reflect associations between the concepts. The bottom of the image features a gradient scale indicating the timeline from 2010 to 2020, likely representing the evolution of these topics over the years. The layout encourages exploration from the central theme outward, revealing interconnected ideas and concepts visually.Longitudinal analysis of keywords
Source: Authors’ own work on VOSviewer