Characterization of NH₃ and NO_x Emissions from Anthropogenic Sources in Jiangsu Province from 2016 to 2022.

To investigate the emissions of gaseous reactive nitrogen from anthropogenic sources in Jiangsu Province, an emission inventory of NH₃ and NO_x during 2016-2022 was developed using the emission factor method based on activity data from various emission sectors. The interannual variation trends and source characteristics of NH₃ and NO_x emissions were analyzed, and their spatial distribution in terms of total emissions and emission intensity was examined using ArcGIS. Results show that NH₃ emissions first declined from 355.95 Gg in 2016 to 288.07 Gg in 2019, then increased to 303.79 Gg in 2022. Agricultural activities like livestock breeding and nitrogen fertilizer application were the key drivers of NH₃ emissions, while NO_x emissions exhibited a general downward trend, primarily influenced by energy, industrial and transportation sectors, with the highest and lowest values recorded in 2016 (1 130.40 Gg) and 2021 (858.45 Gg), respectively. The emission intensities of NH₃ and NO_x exhibited significant regional differences, with higher NH₃ emission intensities predominantly concentrated in northern Jiangsu Province characterized by intensive agricultural activities, while NO_x emissions primarily clustered in the industrialized southern Jiangsu region.