Retrofitting Coal Power Units with Biomass and Coal Cofiring Intensifies Air Pollution and Health Risks

Retrofitting coal power units with biomass and coal cofiring technology provides a promising pathway toward low-carbon transition. However, such a retrofitting approach may also pose potential environmental and health risks, even aggravating regional disparities. Here, we propose a comprehensive framework to evaluate the associated risks of Biomass and Coal Cofiring Retrofit (BCCR) in China. We find that air pollutants such as SO₂, PM_2.5, and NO_x will increase by an average of 27.9, 38.04, and 42.79% respectively compared to the scenario with no BCCR. The national-wide PM_2.5 concentration-related premature mortalities in scenarios with BCCR are projected to increase by 23.53% on average in 2030. Moreover, the Highest-20% of provinces with higher health risks (also health vulnerable groups such as the elderly and children concentrated area) are 19 times greater than that in the Lowest-20% group. Results suggest that implementing a Targeted Pollution Control strategy for areas with higher health risks would be an economical and effective way to reduce the total pollutants emissions and mitigate the regional disparities in health risks. Our research proposes stringent pollution control measures on biomass and coal cofiring retrofit in advance in regions with the utmost necessity to facilitate a fair transition toward clean energy.