Compressed air is used in a variety of applications. The compressed air system can accumulate excess moisture which could cause damage to the compressor as well as the applications using it. According to industrial air manufacturers, regular maintenance is required. The moisture can be removed both manually and with the help of dryers. Causes Of Air Moisture All air holds moisture. However, it varies according to pressure and temperature. Air holds more water when the temperature is higher and that’s why, in warmer months, humidity is higher in the air.