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Air pollution and asthma

¹Department of Thoracic Medicine, National Heart and Lung Institute, London, UK.

Postgraduate Medical Journal

|May 1, 1994

Summary

This summary is machine-generated.

Common air pollution levels do not appear to worsen asthma symptoms or increase its prevalence. Only exceptionally high concentrations of specific pollutants like sulfur dioxide (SO2) may trigger bronchoconstriction in asthmatics.

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Area of Science:

Environmental Health
Respiratory Medicine
Toxicology

Background:

The link between air pollution and asthma exacerbation is a subject of ongoing scientific and public health debate.
Asthma prevalence and morbidity have seen a global increase, prompting investigations into environmental triggers.

Purpose of the Study:

To critically evaluate the scientific evidence linking ambient air pollution levels to asthma prevalence, morbidity, and aetiology.
To determine if commonly encountered air pollutants exacerbate asthma symptoms or influence disease development.

Main Methods:

Review and synthesis of existing epidemiological and experimental studies on air pollutants and asthma.
Analysis of data on sulfur dioxide (SO2), suspended particles, ozone, and nitrogen dioxide (NO2) in relation to respiratory symptoms.

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Main Results:

Most air pollutants at typical environmental concentrations show little evidence of worsening asthma or increasing attacks.
Exceptionally high levels of sulfur dioxide (SO2) and suspended particles may trigger bronchoconstriction and symptoms in asthmatics.
Ozone and nitrogen dioxide (NO2) at recorded levels have minimal impact on airway function in normal and asthmatic individuals.

Conclusions:

Current evidence does not support a significant role for typical air pollution levels in the increased prevalence or morbidity of asthma.
While extreme pollutant concentrations can trigger symptoms, atmospheric pollution is unlikely to be a primary cause or major contributor to asthma's rise.