Time Lapse: Relative Humidity and Pollutants

These videos by CCI may be short, but the message is impressive: controlling relative humidity and temperature is important, but don't forget about pollutants. 

Time-lapse Video of Deterioration: Two Iron Keys, Incorrect Relative Humidity & Pollutants: https://www.youtube.com/watch?v=c2-wLGmP8sE

Time-lapse Video of Deterioration: Parchment and Iron Key, Incorrect Relative Humidity: https://www.youtube.com/watch?v=KXaGY940Slk