Table 2.

Effects of air pollutants on the risk of atopic dermatitis (meta-analysis).

Pollutants		Odds Ratio (95% CI)	Reference
Tobacco smoke	Active smoking	1.87 (1.32–2.63)	Kantor et al.	2016	[55]
	Passive smoking	1.18 (1.01–1.38)
	Maternal smoking	2.95 (2.43–3.60)	Ng et al.	2020	[56]
PM2.5		1.04 (0.96–1.12)	Ngoc et al.	2017	[51]