Himanshu Shekher, Sushil Kumar Yadav, Pankaj Kumar Yadav, Shalini Tiwari, Kaushalendra Prakash Goswami. Assessment of air pollution level in Sonbhadra district using air quality index . NGJI [Internet]. 2023 Dec. 31 [cited 2025 Jul. 12];69(4). Available from: http://65.0.158.54/index.php/ngji/article/view/845