Patrick H. Ryan, PhD, MS

Associate Professor, UC Department of Pediatrics

Department of Environmental Health

Phone: 513-803-4704


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Epidemiology; air pollution; exposure assessment


To date, Dr. Ryan has authored more than 30 publications and has presented his research at numerous national and international conferences. He has received research funding from the National Institute of Environmental Health Sciences, the U.S. Environmental Protection Agency, the U.S. Department of Housing and Urban Development, the Centers for Disease Control and Prevention, as well as industry and private foundations. Dr. Ryan has also been an invited speaker at numerous national conferences and universities, a guest lecturer for environmental epidemiology courses at the University of Cincinnati, and has advised masters and doctoral students in epidemiology, biostatistics, and industrial hygiene in the Department of Environmental Health at the University of Cincinnati. In 2006 Dr. Ryan received a STAR award from the American Academy of Allergy, Asthma, and Immunology and in 2010 he was selected as one of ten Science Communication Fellows by Environmental Health Sciences.

Dr. Ryan is the principal investigator of the Cincinnati Anti-Idling Campaign Study, an academic-community partnership to examine and reduce the impact of traffic-related air pollution at schools on children with asthma.  He is also co-PI of a collaborative study to develop and field test, in a cohort of asthmatic children, a personal sensor to measure exposure to ultrafine particles.  Dr. Ryan also serves as co-investigator of the Cincinnati Childhood Allergy and Air Pollution Study (CCAAPS), a longitudinal birth cohort study of the effects of diesel exhaust particles on the development of allergies and asthma. His research with the CCAAPS study includes the development of land-use regression models for air pollution exposure assessment and the association between air pollution and neurobehavioral development.   Additional research includes studies of indoor pollutants and mold, environmental exposure to asbestos in Libby, MT, and the elemental composition of PM2.5.  

Education and Training

PhD: Epidemiology, University of Cincinnati, Cincinnati, OH.

MS: Epidemiology, University of Cincinnati, OH.


View PubMed Publications


Impact of Traffic-Related Particles on Asthma for Students in an Urban School District. Principal Investigator. National Institute of Health (NIH) National Institute of Environmental Health Sciences (NIEHS).  Oct 2009 – Sept 2012.

Analysis of Personal and Home Characteristics Associated with the Elemental Composition of PM2.5 in Indoor, Outdoor, and Personal Air in the RIOPA Study. Principal Investigator. Health Effects Institute (HEI).  Aug 2010 – July 2012.

Field Validation of a Personal Sensor for Ultrafine PM in Asthmatic Children. Co-Principal Investigator. NIEHS. July 2011 – June 2013.

Diesel, Allergens, and Gene-Environment Interactions. Co-Investigator. NIEHS. July 2007 – June 2012.

The Libby Community Childhood Health Investigation and Exposure Follow-Up Study. Co-Investigator. Co-Investigator. NIEHS. October 2009 – Sept 2013.

Synergistic Effect of Home Exposure to Aeroallergens and Traffic-Related Air Pollution. Department of Housing and Urban Development (HUD). Co-Investigator. Apr 2011 – March 2013.