Determination of the Moisture Content and the Generation of Airborne Particulate Matter From Various Types of Footing From Indoor Riding Arenas Considered to Have Optimal Rideability.
Authors: Claußen Gesche, Grau Daniela, Hessel Engel F
Journal: Journal of equine veterinary science
Summary
# Editorial Summary Indoor riding surfaces must balance competing demands: sufficient grip and elasticity for safe rideability alongside minimal dust production to protect respiratory health, yet operators have lacked clear guidance on the optimal moisture levels for different footing types. Researchers collected loose footing samples from 25 facilities with arenas considered to have ideal rideability—five pure sand, ten sand-wood chip, and ten sand-fibre surfaces—and measured moisture content, density, particle size distribution, and airborne particulate matter (PM10) release under standardised laboratory conditions using a TEOM 1400a particulate monitor. Sand-wood chip surfaces maintained significantly higher moisture content (14.96%) than sand-fibre (8.99%), whilst pure sand fell between them; critically, sand-fibre footings generated 2.50–5.47 times more PM10 than the other surface types (averaging 32.06 mg/m³air compared with 12.81 and 5.86 mg/m³air respectively), driven largely by extreme dust release from three poorly-compacted samples. For sand-fibre surfaces specifically, density emerged as the key variable affecting dust generation—lower density (associated with higher fibre content and moisture) significantly increased particulate release, likely due to fibre segregation during use. Farriers and arena managers should recognise that sand-fibre footings demand rigorous maintenance protocols: consistent watering and strategic grooming to prevent fibre migration to the surface are essential to controlling respiratory hazards, even when subjective rideability assessment appears adequate.
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Practical Takeaways
- •Sand-fibre arena surfaces with high fibre content require regular, adequate watering to prevent excessive dust generation, even when rideability appears optimal
- •Use proper arena grooming techniques to prevent segregation of fibrous material, which dramatically increases dust and respiratory hazard for horses
- •Sand-based and sand-wood chip surfaces produce significantly less airborne dust than sand-fibre surfaces at optimal rideability conditions, making them potentially better for respiratory health
Key Findings
- •Sand-wood chip footing had significantly higher moisture content (14.96%) than sand-fibre footing (8.99%), while pure sand was intermediate (10.82%)
- •Sand-fibre footing released 2.50-5.47 times more PM10 particulate matter (32.06 mg/m³air) compared to pure sand (12.81 mg/m³air) and sand-wood chips (5.86 mg/m³air)
- •Density of sand-fibre footing significantly influenced airborne particulate matter release; lower density footings released more dust
- •Three of ten sand-fibre samples showed extremely high particulate matter release due to segregation of fibrous material during testing, mimicking poor grooming conditions