Exposure to hydrocarbon concentrations while commuting or exercising in Dublin

Area of Science:

• Environmental Science
• Public Health
• Occupational Health

Background:

• Traffic-related air pollution is a significant concern in urban environments.
• Limited research quantifies hydrocarbon exposure differences across commuter transport modes.
• Understanding commuter exposure is vital for public health strategies.

Purpose of the Study:

• To compare traffic-derived hydrocarbon exposure between bus and cycling commuters in Dublin.
• To assess the impact of travel time and breathing rates on inhaled pollutant doses.
• To evaluate hydrocarbon concentrations at recreational sites near traffic.

Main Methods:

• Air sampling for five hydrocarbons (benzene, 1,3-butadiene, acetylene, ethane, ethylene) during rush hours.
• Measurement of journey times and typical breathing rates.
• Calculation of inhaled pollutant mass dose for different transport modes.
• Assessment of hydrocarbon concentrations at playing pitches near a motorway and city center.

Main Results:

• Bus commuters experienced significantly higher ambient hydrocarbon concentrations than cyclists.
• Pollutant levels were elevated on the congested side of the road.
• When considering inhaled dose, cyclists showed slightly higher hydrocarbon uptake than bus passengers.
• Inhaled pollutant doses at playing pitches were occasionally higher than those for bus and bicycle commuters.

Conclusions:

• Commuter transport mode significantly influences exposure to traffic-related hydrocarbons.
• Inhaled dose, not just ambient concentration, is critical for assessing health risks.
• Recreational sites near heavy traffic may pose a notable inhalation risk, especially for children.