Carbon Neutrality Drives PAH Mitigation and Multimedia Health Cobenefits in China

Area of Science:

• Environmental Science
• Public Health
• Climate Policy

Background:

• Polycyclic aromatic hydrocarbons (PAHs) are potent carcinogens co-emitted with CO2.
• The emission reduction potential and health cobenefits of decarbonization pathways for PAHs are underexplored.

Purpose of the Study:

• To develop an integrated modeling framework to quantify PAH emission reductions, spatial distribution, and health impacts under distinct carbon mitigation scenarios.
• To assess the synergistic effects of climate policies on both CO2 and PAH emissions and associated health outcomes.

Main Methods:

• Integrated modeling framework to quantify PAH emission reductions and spatial distribution.
• Analysis of distinct carbon mitigation scenarios from 2020 to 2060.
• Assessment of health impacts and risks associated with reduced PAH concentrations.

Main Results:

• Enhanced climate policies could reduce CO2 by 9.5 Gt and PAH emissions by 42.8 kt (65.8% reduction) from 2020 to 2060.
• Energy production optimization significantly contributes to synergistic PAH emission reductions.
• Carbon neutrality scenario shows substantial decreases in national BaP concentrations and >50% reduction in health risks in populated areas by 2060.

Conclusions:

• Achieving climate targets, particularly in China, yields significant synergistic benefits for air quality and public health.
• Decarbonization pathways offer considerable health cobenefits by mitigating exposure to carcinogenic PAHs.
• Proactive climate action is crucial for simultaneous environmental and public health improvements.