Effect of hourly concentration of particulate matter on peak expiratory flow in hospitalized children: a panel study

Area of Science:

• Environmental Health
• Pediatric Pulmonology
• Air Pollution Toxicology

Background:

• Limited data exists on the immediate effects of short-term air pollution on lung function in asthmatic children.
• Understanding these associations is crucial for managing pediatric asthma exacerbations.

Purpose of the Study:

• To investigate the association between hourly concentrations of fine particulate matter (PM2.5) and peak expiratory flow (PEF) in children hospitalized with severe asthma.
• To quantify the impact of short-term PM2.5 exposure on lung function in this vulnerable population.

Main Methods:

• PEF was measured twice daily in 17 children (8-15 years) hospitalized with severe asthma over three months.
• Measurements were correlated with hourly PM2.5 concentrations, adjusting for covariates like sex, age, height, and temperature.
• Lagged exposures up to 24 hours were analyzed to assess immediate and short-term effects.

Main Results:

• Increased 24-hour mean PM2.5 concentration was significantly associated with decreased morning and evening PEF.
• Hourly PM2.5 increases of 10 μg/m3 correlated with an approximate 3 l/minute reduction in PEF across several lagged hours.
• These associations persisted even after adjusting for other air pollutants.

Conclusions:

• Hourly increases in PM2.5 concentrations are linked to reduced lung function (PEF) in hospitalized children with severe asthma.
• The findings underscore the immediate respiratory risks posed by fine particulate air pollution to children with severe asthma.