Occupational exposure to soft paper dust and mortality

Area of Science:

• Occupational health
• Pulmonary medicine
• Epidemiology

Background:

• Occupational exposure to soft paper dust is linked to reduced lung function.
• The association between soft paper dust exposure and the risk of developing asthma or chronic obstructive pulmonary disease (COPD) remains unclear.

Purpose of the Study:

• To investigate the mortality risk of asthma and COPD among workers with high occupational exposure to soft paper dust.
• To determine if exposure levels exceeding 5 mg/m³ for at least 5 years increase the risk of obstructive lung diseases.

Main Methods:

• A cohort study of 7870 workers from three Swedish soft paper mills (1960-2013).
• Workers were categorized into 'high-exposed' (dust > 5 mg/m³ for ≥ 5 years) and 'low-exposed' groups.
• Standardized mortality ratios (SMRs) were calculated using the Swedish population as a reference.

Main Results:

• High-exposed workers showed increased mortality from obstructive lung disease (SMR 1.89), primarily driven by asthma (SMR 4.13).
• Increased asthma mortality was observed in high-exposed men (SMR 4.38).
• No significant increase in asthma mortality was found in low-exposed workers; COPD mortality was not clearly elevated in high-exposed workers (SMR 1.52).

Conclusions:

• High occupational exposure to soft paper dust is associated with increased asthma mortality.
• Workplace exposure limits for soft paper dust should not exceed 5 mg/m³ to protect worker health.