IJIRCSTJournal International Journal of Innovative Research in Computer Science and Technology I S Volume 8 Issue 4 Department of Electronics & Communication Engineering English July - August 2020 N N Y 2020 07 28 Computer Sciences Air Quality Monitoring and Purification Devices: A Review English Y 285 289 Praveen Thakran English Y Malla Sainadh Ram Narsimha English N Nisha Charaya English N https://doi.org/10.21276/ijircst.2020.8.4.6 Air quality has been degrading due to increase in vehicles and industrial activities. These industrial activities and vehicles cause most of the air pollutants as gases, but some are very tiny solid particles, such as dust, smoke. Most commonly detected air pollutants are Sulphur Dioxide (SO2), particulate matter, Hydrocarbons (HC), Lead, Carbon Dioxide (CO2) and Carbon Monoxide (CO), Nitrogen Oxides (NOx), and smog. These air pollutants affect both the indoor and outdoor air. The indoor air is more polluted, due to the release of the air borne chemicals while cooking and from furniture. The polluted air is unsafe for human health. So, the need of an indoor automatic air purifier arises. This paper presents a thorough study of different techniques and models developed to monitor the air quality and hereby control the air purifier system. English Pollution, indoor air, purifier, air quality https://ijircst.org/abstract.php?article_id=529