Particle mapping in stables at an American Thoroughbred racetrack

Area of Science:

• Equine respiratory health
• Environmental monitoring
• Aerobiology

Background:

• Airway inflammation and tracheal mucus are prevalent in racehorses.
• Airborne particles, particularly fine and coarse, exacerbate airway inflammation in humans and animal models.
• The distribution of airborne particle sizes in American racing stables remains uninvestigated.

Purpose of the Study:

• To quantify the concentration and number of airborne particles of various sizes within racing stables.
• To assess regional and seasonal variations in particle distribution.
• To identify environmental factors influencing particle exposure in equine environments.

Main Methods:

• Utilized direct-reading instruments for real-time measurement.
• Monitored mass concentration and particle counts three times daily (morning, midday, afternoon).
• Conducted measurements across three distinct racing stables during July, September, and November.

Main Results:

• Particle concentrations peaked in September and November, with lower levels in July.
• Early morning particle concentrations were significantly higher than later in the day.
• Enclosed stables showed higher particulate levels than open-sided ones; stall location also influenced concentrations.

Conclusions:

• Airborne particle levels reaching the lower airways are influenced by stable design, management practices, time of day, season, and stall location.
• Particle mapping aids in identifying high-risk environments for horses exposed to detrimental particulates.
• This study provides a foundation for targeted interventions to improve air quality in equine stables.