Table 1.
Outdoor air pollutants and aspects of health outcomes.
Table 2.
Key information to be charted during the review process.
Fig 1.
The diagram of eligible studies (inclusive articles) selection.
Fig 2.
Number of inclusive studies published between 1992 and 2018.
The included studies increased during this period, more than 75% of studies were published after 2011.
Table 3.
General inclusive articles descriptions.
Table 4.
Regions of the studies’ descriptions.
Fig 3.
Word cloud of the country of included studies.
Word cloud representing the country of included studies, the size of each term is in proportion to its frequency.
Table 5.
Health outcome categories of outdoor air pollution.
Fig 4.
Word cloud of outdoor air pollution related health outcomes.
Word cloud representing the health outcomes of included studies, the size of each term is in proportion to its frequency.
Table 6.
Description of the types of affected groups.
Table 7.
Health outcomes according to authors’ conclusions.