Nebulizers and compressors work together to deliver medication in the form of a mist to people with asthma or other respiratory conditions. The liquid medication is first placed into a nebulizer cup. When the machine is turned on, the compressor pumps air into the nebulizer. The nebulizer quickly transforms the liquid medication into a mist that can be inhaled by the patient using a mouthpiece. Compressor nebulizers are available in stationary and portable models. A stationary model is typically used in hospitals, doctor's offices, or in a person's house. Portable nebulizers are smaller and more lightweight, making them great for on-the-go use and for traveling. Other nebulizer parts, such as filters and tubing, are used along with a nebulizer compressor and need to be replaced regularly in order to keep the machine in working condition.