S, Nagaraj, and Dr. Rajashree V Biradar. “A Literature Review on Effective Monitoring of NOx Pollutants Using Environmental Wireless Sensor Networks (EWSN)”. International Journal of Engineering & Technology 8, no. 1.10 (March 1, 2019): 159–166. Accessed May 3, 2024. https://www.sciencepubco.com/index.php/ijet/article/view/28324.