Table A3.

The quality assessment of the included literature.

No.	Study	Conjunctivitis Disease Occurrence Verification (1 point)	Quality of Air Pollutant Measurement (1 point)	Adjustment Degree of Confounders (3 point)	Total Score (5 point)	Quality Category
1	Bourcier et al. (2003) [13]	0	1	3	4	Low quality
2	Larrieu et al. (2009) [14]	1	1	2	4	Medium quality
3	Chang et al. (2012) [4]	1	1	2	4	Medium quality
4	Chiang et al. (2012) [29]	1	1	3	5	High quality
5	Szyszkowicz et al. (2012) [27]	1	1	2	4	Medium quality
6	Hong et al. (2016) [6]	1	1	3	5	High quality
7	Szyszkowicz et al. (2016) [28]	1	1	2	4	Medium quality
8	Fu et al. (2017) [5]	1	1	1	3	Medium quality
9	Jamaludin et al. (2017) [30]	0	0	2	2	Low quality
10	Lee et al. (2018) [11]	1	0	0	1	Low quality
11	Seo et al. (2018) [10]	1	0	1	2	Low quality
12	Szyszkowicz et al. (2019) [9]	1	1	1	3	Medium quality