Polycyclic aromatic hydrocarbons from cooking emissions.

Area of Science:

• Environmental Science
• Atmospheric Chemistry
• Public Health

Background:

• Cooking emissions are a significant, yet often overlooked, source of organic aerosol and particle-bound polycyclic aromatic hydrocarbons (PAHs) in urban environments.
• These emissions are recognized as a key component of the cooking-like organic aerosol factor (COA).

Purpose of the Study:

• To quantify the impact of cooking emissions on outdoor particle-bound PAHs levels.
• To identify the primary source of PAHs associated with cooking.
• To assess the health risks and global implications of cooking-related PAHs.

Main Methods:

• Deployment of a Long-Time-of-Flight (LToF) soot particle aerosol mass spectrometer (SP-AMS).
• Utilized a robust receptor model to analyze emission sources.
• Correlated ambient PAH profiles with specific emission sources like frying oil fume.

Main Results:

• Cooking emissions were identified as the dominant source of ambient PAHs, accounting for approximately 90% of total PAHs.
• Traffic emissions contributed only about 10% to ambient PAHs.
• The PAH profile from cooking strongly correlated with frying oil fume, indicating cooking oil as the main source.

Conclusions:

• Cooking emissions, particularly from cooking oil, are a critical source of particle-bound PAHs in ambient air, especially in Chinese cities.
• The findings underscore the need for public health strategies and policy interventions to mitigate cooking-related air pollution.
• Particle-bound PAHs from cooking represent a substantial environmental health concern globally.