This research report concerning the Water and Air Purification Systems and Products: Residential & Commercial presents an in-depth analysis of the development, applications, products, technologies, manufacturers, and trends for products that help make indoor air cleaner and healthier and water purer, both for consumer usage as well as industrial and commercial applications. In developed countries, water is generally clean and safe to drink and air pollution, except in some large cities and industrial areas, is typically low. Nevertheless, indoor air and drinking water in developed countries are not without their problems and can adversely affect human health or otherwise make living and working conditions less appealing. In undeveloped and underdeveloped countries, however, water is often contaminated (when it is available) and indoor air quality is low, primarily as a result of using coal and biomass fuels for heating and cooking. From an industrial and commercial perspective, the need for clean air and clean water is essential to many manufacturing and operational processes.