The phrase "excessive humidity" means that there is too much moisture or dampness in the air, which can make people feel uncomfortable and lead to potential problems like mold growth or damage to certain materials. Full definition
Ideally, the heating, ventilation or air - conditioning systems should have humidity monitoring and automatic controls, so that the eradication of excessive humidity - which will be the most likely cause of problems - is not reliant upon human interaction with the controls. (wideboards.com)
Winner of the 2016 iF Design Award, Savior keeps food at the peak of its freshness by forcing air out with each twist, locking out excessive humidity as well as dry air that can make food go stale. (fb101.com)