Toxicological Evaluation of Realistic Emission Source Aerosols (TERESA)-Power plant studies: assessment of breathing pattern

• Published in: Inhalation toxicology 2011-08, Vol.23 (S2), p.42-59
• Main Authors: Diaz, Edgar A., Lemos, Miriam, Coull, Brent, Long, Mark S., Rohr, Annette C., Ruiz, Pablo, Gupta, Tarun, Kang, Choong-Min, Godleski, John J.
• Format: Article
• Language: English
• Subjects: aerosol sources; Air Pollutants - toxicity; ambient particles; Animals; breathing pattern; Coal; Environmental Exposure - adverse effects; Environmental Monitoring - methods; Inhalation Exposure - adverse effects; Male; Models, Theoretical; particulate matter; Particulate Matter - toxicity; Plethysmography, Whole Body; pollution sources; power plant emissions; Power Plants; Rats; Rats, Sprague-Dawley; Respiration - drug effects; Respiratory function; Respiratory Function Tests; respiratory mechanics; Toxicity Tests
• ISSN: 0895-8378; 1091-7691
• DOI: 10.3109/08958378.2010.578169

Our approach to study multi-pollutant aerosols isolates a single emissions source, evaluates the toxicity of primary and secondary particles derived from this source, and simulates chemical reactions that occur in the atmosphere after emission. Three U.S. coal-fired power plants utilizing different coals and with different emission controls were evaluated. Secondary organic aerosol (SOA) derived from α-pinene and/or ammonia was added in some experiments. Male Sprague-Dawley rats were exposed for 6 h to filtered air or different atmospheric mixtures. Scenarios studied at each plant included the following: primary particles (P); secondary (oxidized) particles (PO); oxidized particles + SOA (POS); and oxidized and neutralized particles + SOA (PONS); additional control scenarios were also studied. Continuous respiratory data were obtained during exposures using whole body plethysmography chambers. Of the 12 respiratory outcomes assessed, each had statistically significant changes at some plant and with some of the 4 scenarios. The most robust outcomes were found with exposure to the PO scenario (increased respiratory frequency with decreases in inspiratory and expiratory time); and the PONS scenario (decreased peak expiratory flow and expiratory flow at 50%). PONS findings were most strongly associated with ammonium, neutralized sulfate, and elemental carbon (EC) in univariate analyses, but only with EC in multivariate analyses. Control scenario O (oxidized without primary particles) had similar changes to PO. Adjusted R2 analyses showed that scenario was a better predictor of respiratory responses than individual components, suggesting that the complex atmospheric mixture was responsible for respiratory effects.