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Marginal reduction in surface NO2 attributable to airport shutdown: A machine learning regression-based approach.
Bo Han1, Tingwei Yao2, Guojian Li3
1School of Transportation Science and Engineering, Civil Aviation University of China, Tianjin, China; Research Centre for Environment and Sustainable Development of Civil Aviation Administration of China, Civil Aviation University of China, Tianjin, China.
Environmental Research
|August 19, 2022
Summary
Airport emissions significantly impact local air quality, contributing up to 24% of nitrogen dioxide (NO2). A COVID-19 flight ban revealed airport closures reduce NO2 by 18.6%, highlighting aviation
Area of Science:
- Environmental science
- Atmospheric chemistry
- Public health
Background:
- Aviation and airport activities significantly impact air quality, yet receive less attention than other transport sectors.
- Assessing airport emission impacts is challenging due to confounding factors like meteorology.
- COVID-19 flight bans offer a unique opportunity to study airport emission effects.
Purpose of the Study:
- To quantify the impact of civil airport emissions on local nitrogen dioxide (NO2) air quality.
- To evaluate the air quality benefits of airport closures during the COVID-19 pandemic.
- To assess the contribution of airport emissions to overall NO2 levels.
Main Methods:
- Utilized a machine learning predictive model.
- Analyzed observational air quality data from a quasi-natural experiment (flight ban).
- Compared NO2 levels during normal operations versus lockdown periods.
Main Results:
- The total lockdown-induced NO2 reduction was 16.7 μg/m³, a 73% decrease.
- Airport flight bans accounted for a 3.1 μg/m³ NO2 reduction (18.6% of the total lockdown effect).
- Airport emissions contribute up to 24% of local ambient NO2 under normal conditions.
Conclusions:
- Airport-related emissions are a considerable source of local air pollution, particularly NO2.
- Targeting airport emissions can yield significant air quality improvements.
- Regulatory measures must consider aviation's role in meeting air quality standards.
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