In the article titled, “Enhancing indoor air quality – The air filter advantage” published in pages 473-479, issue 5, vol. 32 of Lung India[1], the “Summary and Conclusions” section is written incorrectly and should read as the following:“Despite the rapid rise in environmental pollutants, the causal pathways leading to adverse health effects is often complex and poorly understood.Studies appear to suggest, that reduction in particulate matter and allergens results in reducing symptoms and in certain cases, preventing disease progression across all age groups, including the elderly and children. The evidence is apparent, in chronic respiratory diseases, such as asthma and in cardiovascular health.Reduction in particulate matter and allergens is achieved successfully through efficient air filters. The British Guideline on Asthma Management from the British Thoracic Society recommends use of air filters for removal of pet and other allergens.[45]Technologically advanced air filter systems are now available which efficiently remove particulate matter, resulting in significant health benefits to patients of asthma and cardiovascular disease. Cost-benefit studies are currently not available; however, such studies are required in countries like India for assessing the utility of universal application of these devices.”