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Comic books are modern publications, the earliest of which are from the 19th century industrial era when machine-made, wood pulp paper had already become the dominant paper product. Due to the inherent chemical instabilities of wood pulp papers and the late development of U.S. paper standards (in the 1980s), many comic book collections contain acidic books. Good storage is especially critical to the preservation of acidic paper materials. Guidelines for good storage:

• A cool (room temperature or below), relatively dry (about 35% relative humidity), clean, and stable environment (avoid attics, basements, and other locations with high risk of leaks and environmental extremes)
• Minimal exposure to all kinds of light; no exposure to direct or intense light
• Distance from radiators and vents
• Supportive protective enclosures*

https://www.loc.gov/preservation/care/comics.html