New Delhi, Dec. 2 -- Dry winter months often bring two problems at the same time. The air inside homes becomes moisture-deprived and uncomfortable, and pollution levels rise sharply outdoors and gradually seep indoors. Many people think of buying either a humidifier or an air purifier, but it can be difficult to understand if both are necessary or if one product can take care of both issues. The confusion is valid because these appliances do very different things even though they work in the same environment. Understanding how each one affects indoor air quality helps you decide what to invest in and how to set up your space for healthier winter living.

A humidifier is designed to add moisture to dry indoor air. When humidity levels drop...