OBJECTS ARE EXPOSED TO HAZARDS
An improper environment can cause irreparable damage.
High humidity promotes mold growth, corrosion, and degradation, while lack of humidity can cause drying and cracking. Fluctuations between extremes can cause warping, buckling, and flaking.
All kinds of light, especially ultraviolet rays from natural and artificial sources, can cause fading and disintegration.
High temperatures can accelerate deterioration.
Pollutants and dust are abrasive and can accelerate harmful chemical reactions.
Pests can infest and destroy many objects.
-A Public Trust at Risk: The Heritage Health Index Report 2005
wwww.heritagehealthindex.org