[Emission Inventory of Industrial Sources in Beijing-Tianjin-Hebei and Surrounding Areas Based on Multi-source...

The current data sources used for establishing emission inventories are relatively homogenous and do not meet the requirement of real-time and accurate environmental management. Multi-source environmental management data could reflect enterprises' detailed information and provide support for emission inventories. To assess the current situation of air pollutants and CO₂ emissions from industrial sources in Beijing-Tianjin-Hebei and its surrounding areas in 2020， this study integrates emergency emission reduction lists with pollution discharge permit data and establishes a high spatio-temporal resolution industrial emission inventory using a combination of "bottom-up" and "top-down" approach. The results showed that the SO₂，NO_x，VOCs，PM₁₀，PM_2.5， and CO₂ emissions from industrial sources in Beijing-Tianjin-Hebei and its surrounding areas in 2020 were 48.72×10⁴， 60.33×10⁴， 108.95×10⁴， 58.82×10⁴， 38.75×10⁴， and 140 873.59×10⁴ t， respectively. Industrial boilers and iron and steel and cement industries accounted for the largest proportion in addition to VOCs， with a total proportion between 51% and 82%. The refining and petrochemical industry accounted for the largest proportion of VOCs （54.1%）. To investigate the impact of the COVID-19 lockdown on industrial source emissions， we quantified the changes in daily emissions of each pollutant and CO₂ during the Spring Festival of 2020. The emissions of air pollutants and CO₂ decreased by 7%-16% and recovered to the pre-holiday level after the holiday， indicating that the industrial emissions sources were less affected by the COVID-19 lockdown. This was mainly because most industrial sources belonged to non-interruptible industries. The study results help to grasp the current situation of industrial source emissions in Beijing-Tianjin-Hebei and the surrounding areas and provide scientific support for the near real-time and refined management of air pollution.