The observed regional changes are consistent in pattern and amount with the changes in SST and the assumption of a near - constant relative humidity increase in water vapour mixing ratio. (ipcc.ch)
Low humidity increases water loss; if enough water is lost the cell fails. (en.wikipedia.org)
Step 5: Keep the humidity and temperature in the home low (high humidity increases the number of allergens able to stay in the air). (smallanimalchanel.com)