China PM2.5 Trends: Impact on Regional Air Quality Beyond 2025

In recent years, PM2.5 levels have gained attention due to their critical impact on air quality and public health. Particularly in China’s Pearl River Delta, a prime hub of industrial activity, these fine particulate matters have shown notable trends. By examining the PM2.5 chemical composition, we can identify the key secondary species responsible for these changes and their implications on regional air quality regulations post-2025.