PM_2.5 from Stir-Fry Cooking in Chinese Cities Leads to Significant Health Impacts

Area of Science:

• Environmental Health
• Indoor Air Quality
• Public Health

Background:

• Stir-fry cooking (SFC) is prevalent in Chinese urban areas.
• Its national-scale impact on indoor air pollution and health is not well understood.

Purpose of the Study:

• To evaluate SFC's contribution to indoor PM2.5 levels.
• To assess the associated health impacts (DALYs) in Chinese cities.

Main Methods:

• PM2.5 measurements in 94 households across 15 cities over one year.
• Decomposition of indoor PM2.5 sources (SFC, infiltration, other).
• Calculation of disability-adjusted life years (DALYs).

Main Results:

• SFC increased indoor PM2.5 by 21% in kitchens and 7% in living rooms.
• PM2.5 exposure linked to SFC contributed 15.1 million DALYs nationally.
• Females and the elderly were disproportionately affected.

Conclusions:

• SFC is a significant source of indoor air pollution in China.
• Health risks from SFC-related PM2.5 are substantial.
• Ventilation, reduced cooking frequency, and air purifiers can mitigate risks.