## About ## This study investigates the methodological rigour of systematic reviews published in the environmental health sciences. Systematic reviews (SRs) should provide comprehensive, trustworthy summaries of what is known about the effects on human health of exposure to environmental challenges. SRs are a relatively new innovation in the environmental health sciences, with the first formal frameworks being published in 2014 (Rooney et al. 2014; Woodruff and Sutton 2014). Concerns about the quality of published SRs have been raised in the biomedical field multiple times (Page et al. 2016). While this provides indirect evidence that the quality of SRs in toxicology and environmental health (“SRs of exposures”) may also be of concern, to date there is little direct evidence relating to this issue. This study seeks to provide that evidence, surveying the frequency with which systematic reviews published in environmental health are implementing recommended methods. See the [project milestones][1] page for a detailed breakdown of the project steps. [1]: https://osf.io/j2d5v/wiki/Project%20Milestones/