Pilot study of air quality index assessment of nitrogen pollutant using lichen as bioindicators in Jakarta and Depok, IndonesiaDavita Adryanti Felicia Sampe, Jessye Maria-Deanne Awuy, Trifena Krista Mustikaning Sekar, Samuel Febrian Wijaya, Alyssa Zahwa Ananda, Devina Trisha Marella, Putra Mahanaim Tampubolon and Retno LestariE3S Web Conf., 211 (2020) 02014DOI: https://doi.org/10.1051/e3sconf/202021102014