Time-dependent air quality and pollutant concentration in the Jingjinji region: future gas capture by green solvents

Abstract

Capturing and converting polluted gases from the air using green solvents (e.g., ionic liquids and deep eutectic solvents) are very important for sustainable development and high air quality; however, these gases should be treated differently due to the fact that their concentration in air changes differently with time. Jingjinji (Beijing–Tianjin–Hebei) region is the largest and most dynamic region in northern China; Beijing (Jing) is also the capital of China. Time-dependent (2016–2020) air quality and the concentration of air pollutants of Jingjinji are very helpful for the sustainable treatment of major air pollutants by green solvents in the future. Results show that the air quality of the Jinjinji region has improved in these years. Moreover, the concentration of most of the air pollutants (e.g., PM2.5, PM10, SO₂, NO₂, CO) in the air of the Jingjinji region has decreased. Nevertheless, the concentration of ozone (e.g., O₃) in the air of the Jingjinji region has shown no decrease recently. This work is a meaningful guide for the utilization of green solvents for gas capture and conversion in the future.