Characterization of atmospheric ammonia over Xi’an, China Aug 23, 2025 Characterization of atmospheric ammonia over Xi’an, China Cao, J., Zhang, T., Chow, J. C., Characterization of atmospheric ammonia over Xi’an, China, AAQR, 9 (2), 277-289 CHINA,DRIPUB,NH3,OGAWA,PASSIVE SAMPLER,XIAN