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Exposure to indoor formaldehyde has been reported to be relevant to several adverse health effects, especially in occupational exposure scenarios. In this study, a systematic review and meta-analysis has been conducted for epidemiological studies published between January 1980 and December 2017 in order to summarize available evidence and to obtain concentration-response (C-R) relationships between different health outcomes and formaldehyde exposure in residences, offices or schools. We searched four databases to identify the related studies. Finally, we selected 31 studies through the systematic review, and included 23 studies in the meta-analysis. The results show that the pooled odds ratios (ORs) for asthma in children were 1.27 (95% CI: 1.20–1.35) in eastern countries and 1.03 (95% CI: 1.02–1.04) in western countries per 10 μg/m³ increase in formaldehyde concentration. For asthma in adults …