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Visualizing Field Data Collection Procedures of Exposure and Biomarker Assessments for the Household Air Pollution Intervention Network Trial in India

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Global Populations Vulnerable to Air Pollution Know Less about Air Quality.

Noah Lim^1,2, Alessandro Del Ponte^1,3,4, Lina Ang^5,6

¹Global Asia Institute, National University of Singapore, 4 Prince George's Pk, Singapore 118403, Singapore.

Environmental Science & Technology

|December 12, 2025

Summary

People most exposed to fine particulate matter (PM2.5) air pollution often have the lowest air quality knowledge (AQ-IQ). Vulnerable demographics, including women and those with less education, demonstrate lower AQ-IQ, highlighting a critical knowledge gap.

Keywords:

PM2.5 air pollution air quality knowledge cross-country sample nationally representative quota survey

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Area of Science:

Environmental Health
Public Health
Social Science

Background:

Fine particulate matter (PM2.5) poses significant global health risks.
Understanding public knowledge about air quality is crucial for effective mitigation strategies.
Disparities in air quality knowledge may exacerbate health inequities.

Purpose of the Study:

To assess the association between fine particulate matter (PM2.5) exposure and air quality knowledge (AQ-IQ).
To identify demographic factors associated with lower AQ-IQ and higher PM2.5 exposure.
To inform public health interventions targeting air pollution awareness.

Main Methods:

A nationally representative quota sample of 10,618 participants across 10 populous countries.
Estimation of PM2.5 concentrations using satellite and ground monitoring data.
Measurement of AQ-IQ through a ten-item questionnaire assessing general, AQI-specific, and best practice knowledge.

Main Results:

Significant variation in annual average PM2.5 levels observed, from 7.58 μg/m³ (US) to 78.00 μg/m³ (Bangladesh).
Highest AQ-IQ recorded in Mexico and China; lowest in Bangladesh and Nigeria.
Women, rural residents, individuals lacking college education, politically conservative individuals, and smokers exhibited significantly lower AQ-IQ (p < 0.05).

Conclusions:

A significant inverse relationship exists between PM2.5 exposure levels and air quality knowledge.
Vulnerable populations demonstrate a critical deficit in understanding air quality issues.
Targeted educational initiatives are needed to bridge the knowledge gap and empower at-risk communities.