Characteristics of airway obstruction severity in relation to air pollutant in asbestos-exposed chronic obstructive pulmonary disease individuals: A cross-sectional study

Our plain-English summary of Characteristics of airway obstruction severity in relation to air pollutant in asbestos-exposed chronic obstructive pulmonary disease individuals: A cross-sectional study, by M. Yu, X. Lu, C. Chen (Science Progress, 2026).

The study

• Authors: M. Yu, X. Lu, C. Chen
• Journal: Science Progress
• Published: 2026;109(2):368504261449072
• Read it: PubMed · Publisher · Free full text

Abstract

ObjectiveDespite of the tentative role of asbestos in chronic obstructive pulmonary disease (COPD), their lung function variation in relation to air pollution remains unexplored. This cross-sectional study aimed to explore the effects of air pollution on severe airway obstruction (SAO) in asbestos-related COPD.MethodsCOPD subjects were retrospectively recruited, and their asbestos exposure and SAO were verified using the existence of pleural plaque in chest X-ray and the predicted value of forced expiratory volume in 1 second in percentage less than 50%, respectively, followed by examining the association between PM2.5, PM10, SO2, NO2, O3, and CO and SAO stratified by asbestos exposure using regression model.ResultsSAO percentage was 67.2% (41/61) and 65.2% (15/23) in COPD subjects without and with asbestos exposure, respectively. An increased 3-day average concentration of CO and O3 correlated with SAO (odds ratio, 95% confidence interval: 0.06, 0.01-0.41 and 0.09, 0.01-0.64, respectively). Moreover, an increased 5-day average CO concentration also correlated with SAO (0.13, 0.02-0.71) prior to hospital admission of COPD subjects irrespective of asbestos exposure, and SAO failed to be associated with asbestos exposure.ConclusionsCertain gaseous pollution at low concentration might generally exhibit a negative association with SAO in COPD subjects, indicating the negligibly negative impact of air pollution on lung function deterioration in asbestos-related COPD.

In plain English

This retrospective cross-sectional study looked at 84 people admitted with chronic obstructive pulmonary disease (COPD) to Cixi People's Hospital in China between January 2019 and December 2020. Twenty-three were classed as asbestos-exposed (14 with occupational and 9 with para-occupational exposure, confirmed by pleural plaques on chest X-ray) and 61 as not exposed. The authors compared lung function between the two groups. They also related local air pollutant levels in the days before admission to severe airway obstruction, defined as an FEV1 below 50% of the predicted value. Severe obstruction was found in 67.2% (41/61) of the non-exposed and 65.2% (15/23) of the exposed subjects, and asbestos exposure was not associated with it. FEV1/FVC was higher in the exposed group (p=0.040). Higher 3-day average carbon monoxide (odds ratio 0.06, 95% CI 0.01-0.41), higher 3-day ozone (0.09, 0.01-0.64) and higher 5-day carbon monoxide (0.13, 0.02-0.71) went with lower odds of severe obstruction. The authors concluded that low concentrations of ozone and carbon monoxide may be negatively associated with severe obstruction regardless of past asbestos exposure. They noted that a cross-sectional design cannot show cause and effect, and that power analyses were not done.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: retrospective observational cross-sectional study of hospital records, with linear and logistic regression adjusted for gender, age, smoking, medication usage and duration of COPD
• Who was studied: 84 COPD inpatients admitted for worsening respiratory symptoms to the Department of Pulmonary and Critical Care Medicine at Cixi People's Hospital (Zhejiang, China), January 2019 to December 2020; 61 without and 23 with asbestos exposure history
• Exposure: Self-reported occupational or para-occupational asbestos exposure, confirmed by pleural plaques on chest X-ray; fiber type not stated. Also daily PM2.5, PM10, SO2, NO2, O3 and carbon monoxide from a Cixi monitoring site, averaged over 1-day lag and 3, 5 and 7 days before hospital admission
• Main results:
  • Of the 23 asbestos-exposed subjects, 14 had occupational and 9 had para-occupational asbestos exposure
  • Severe airway obstruction: 67.2% (41/61) of non-exposed and 65.2% (15/23) of asbestos-exposed COPD subjects (p=0.863)
  • FEV1/FVC was higher in asbestos-exposed subjects (59.55%) than non-exposed subjects (51.13%), p=0.040; GOLD stage, FEV1, FVC and FEV1% predicted were comparable
  • Asbestos exposure was not associated with severe airway obstruction in the logistic regression (for example OR 1.43, 95% CI 0.39-5.25 at 1-day lag; OR 0.87, 0.20-3.81 at 3 days)
  • In all COPD subjects, a higher 3-day average carbon monoxide concentration was associated with lower odds of severe airway obstruction (OR 0.06, 95% CI 0.01-0.41, p=0.004)
  • A higher 3-day average ozone concentration was associated with lower odds of severe airway obstruction (OR 0.09, 95% CI 0.01-0.64, p=0.016)
  • A higher 5-day average carbon monoxide concentration was associated with lower odds of severe airway obstruction (OR 0.13, 95% CI 0.02-0.71, p=0.018); no other pollutant at any time point was significantly associated
  • No air pollutant was significantly correlated with FEV1/FVC in either group
  • In non-exposed subjects only, some pollutants were linked to FEV1% predicted. Lower values went with 1-day carbon monoxide (beta -0.422, p=0.045), 3-day ozone (beta -0.353, p=0.046) and 7-day ozone (beta -0.419, p=0.030). Higher values went with 3-day SO2 (beta 0.473, p=0.040) and 7-day SO2 (beta 0.636, p=0.009). No significant relationship was found in asbestos-exposed subjects
• The authors' conclusion: The authors concluded that low concentrations of ozone and carbon monoxide during short-term exposure may be negatively associated with severe airway obstruction in COPD subjects, irrespective of past asbestos exposure and/or pleural plaques. They also concluded that asbestos-exposed COPD subjects may be unlikely to be susceptible to lung function deterioration from short-term air pollution episodes, and called for a cohort study to verify this.
• Limitations the authors state:
  • The cross-sectional design cannot provide cause-effect interpretation, and power analyses were not done
  • Baseline COPD severity and lung function measurements were unavailable
  • The findings apply only to air pollution levels within Chinese national standards, not to worse pollution

Topics

Medical terms in this study, explained in our Lexicon: COPD, Asbestos Exposure, Pleural Plaques, Chest X-Ray, Odds Ratio, confidence interval.

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