Cumulative exposure to dust causes accelerated decline in lung function in tunnel workers

Area of Science:

• Occupational Health
• Environmental Medicine
• Pulmonary Medicine

Background:

• Underground construction involves exposure to various pollutants.
• Long-term effects of these exposures on respiratory health are not fully understood.
• Assessing lung function decline and respiratory symptoms in tunnel workers is crucial.

Purpose of the Study:

• To investigate the risk of lung function decline and respiratory symptoms in underground construction workers.
• To correlate these health outcomes with cumulative exposure to dust and gases.
• To compare tunnel workers with a reference group of heavy construction workers.

Main Methods:

• A longitudinal study involving 96 tunnel workers and 249 reference workers examined over 8 years (1991-1999).
• Personal cumulative exposure to respirable dust, alpha-quartz, oil mist, and nitrogen dioxide was measured.
• Spirometry, respiratory symptom questionnaires, and chest radiographs were utilized.

Main Results:

• Tunnel workers showed an accelerated annual decrease in forced expiratory volume in 1 second (FEV1), particularly with higher cumulative exposure to respirable dust and alpha-quartz.
• The annual FEV1 decline was significantly higher in non-smoking tunnel workers (50-63 ml) compared to non-exposed non-smokers (25 ml).
• Tunnel workers had an increased odds ratio for new respiratory symptoms, linked to cumulative respirable dust exposure.

Conclusions:

• Cumulative exposure to respirable dust and alpha-quartz are primary drivers of airflow limitation in underground construction workers.
• Cumulative respirable dust exposure is the leading risk factor for respiratory symptoms in this population.
• Findings underscore the urgent need for enhanced exposure control measures in underground construction environments.