Related Experiment Video
Updated: Aug 7, 2026

Measuring Carbon Content in Airway Macrophages Exposed to Carbon-Containing Particulate Matters
Published on: July 12, 2024
Respiratory symptoms in Ecuadorian workers associated with informal labor and cantonal satellite pollution metrics
Juan Pablo Piedra1, Marco Erazo-Vallejo1, Ketty Pinargote-Cedeño1
1Facultad de Ciencias Médicas, Universidad de las Américas, Quito, Ecuador.
Introduction:
Evidence on the association between ambient pollution and occupational hazards in Ecuador remains limited. This cross-sectional study evaluated the association between working conditions, satellite-derived ambient pollutants, geographic factors, and respiratory symptoms.
Methods:
We analyzed 1,807 workers across four sectors. Respiratory symptoms (ECRHS) were cross-referenced with Sentinel-5P telemetry, utilizing z-score standardized environmental variables and selecting optimal spatial/temporal concentration percentiles (p25, p50, p75, and p95) via the Akaike Information Criterion (AIC) for each outcome. Multivariable penalized logistic regression (Firth's method) identified factors associated with respiratory symptoms.
Results:
Informal employment showed the strongest association with respiratory symptoms, including asthma (aOR 12.56; 95% CI: 5.09-32.87), wheezing (aOR 6.78; 95% CI: 1.83-27.89), chronic cough (aOR 4.14; 95% CI: 2.26-7.74), and chronic phlegm (aOR 2.53; 95% CI: 1.39-4.67). Direct workplace chemical inhalation, compounded by a complete lack of risk awareness, was associated with significantly higher odds for asthma, wheezing, and chronic cough. Geospatially, after controlling for canton-level altitude-which acted as an independent protective factor against asthma (aOR 0.78; 95% CI: 0.66-0.93)-nitrogen dioxide (NO2) and sulfur dioxide (SO2) emerged as the primary independent environmental predictors for chronic phlegm and cough, while ozone lost statistical significance.
Discussion/Conclusion:
Informal employment and unprotected chemical inhalation are strongly associated with respiratory symptoms, frequently exceeding the risks observed in traditional high-exposure sectors. Furthermore, regional atmospheric pollution showed a significant statistical association with chronic respiratory outcomes at the cantonal level. Integrating high-resolution aerospace monitoring into occupational health surveillance represents a potential strategy to address these overlapping structural vulnerabilities; however, causal inference remains limited by the cross-sectional design.
More Related Videos
09:33Visualizing Field Data Collection Procedures of Exposure and Biomarker Assessments for the Household Air Pollution Intervention Network Trial in India
Published on: December 23, 2022
09:50Real-World M3-BREATHE: Toward Multimodal Mobile Monitoring of Behaviour, Respiration, and Exposures for Treatment and Health Evaluation
Published on: June 5, 2026
Related Concept Videos
Chronic Obstructive Pulmonary Disease I: Introduction
Chronic Obstructive Pulmonary Disease IV: Clinical Manifestations
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features
Chronic Obstructive Pulmonary Disease
Smoking is a primary risk factor for COPD, with over 80% of patients having a history of it. Patients typically experience progressive dyspnea or labored breathing, frequent coughing, and recurrent pulmonary infections. Many eventually succumb to respiratory failure, characterized by...
Asthma III: Clinical Manifestations
Chronic Obstructive Pulmonary Disease-III: Symptoms and Complications.
Symptoms of COPD can be classified as primary or systemic. Primary symptoms relate to reduced airflow, while systemic or extrapulmonary symptoms relate to COPD's broader impact on the body.
Primary Symptoms of COPD: