Patrick H. Ryan, PhD, MS

Academic Affiliations

Associate Professor, UC Department of Pediatrics

UC Department of Environmental Health

Phone 513-803-4704


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.

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

MS: Epidemiology, University of Cincinnati, OH.

View PubMed Publications

Ryan PH, Reponen T, Simmons M, Yermakov M, Sharkey K, Garland-Porter D, Eghbalnia C, Grinshpun S. The Impact of an Anti-Idling Campaign on Outdoor Air Quality at Four Urban Schools. Environmental Science: Processes & Impacts. 2013; 15(11):2030-2037.

Newman NC, Ryan PH, LeMasters GK, Levin L, Bernstein D, Khurana-Hershey GK, Lockey JE, Villareal M, Reponen T, Grinshpun S, Sucharew H, Dietrich KN. Traffic Related Air Pollution Exposure in the First Year of Life and Behavioral Scores at Age Seven. Environmental Health Perspectives. 2013;121:731-736.

Eghbalnia C, Sharkey K, Garland-Porter D, Alam M, Crumpton M, Jones C, Ryan PH. A Community-Based Participatory Research Partnership to Reduce Vehicle Idling Near Public Schools. Journal of Environmental Health. 2013;75(9):14-20.

Ryan PH, Dihle M, Griffin S, Taylor R, Hilbert T, Adjei S, Lockey JE. Erionite in road gravel associated with interstitial and pleural changes – an occupational hazard in the western United States. Journal of Occupational and Environmental Medicine. 2011;53(8):893-899.

Ryan PH, Bernstein D, Reponen T, Levin L, Grinshpun S, Villareal M, Lockey J, Hershey GK, Burkle J, LeMasters GK. Exposure to traffic related-particles and endotoxin during infancy is associated with wheezing at age three. American Journal Respiratory and Critical Care Medicine. 2009;180:1068-1075.

Appatova AS, Ryan PH, LeMasters GK, Grinshpun SA. Proximal Exposure of Public Schools and Students to Major Roadways: A Nationwide US Survey. Journal of Environmental Planning and Management. 2008; 51(5):631-646.

Ryan PH, LeMasters GK, Levin L, Burkle J, Biswas P, Hu S, Grinshpun S, Reponen T. A Land-Use Regression Model for Estimating Microenvironmental Diesel Exposure Given Multiple Addresses From Birth Through Childhood. Science of the Total Environment. 2008;404:139-147.

Ryan PH, LeMasters GK. A review of land-use regression models for characterizing intraurban air pollution exposure. Inhalation Toxicology. 2007;19(Suppl 1):127-133.

Ryan PH, LeMasters GK, Biswas P, Levin L, Hu S, Lindsey M, Bernstein DI, Lockey J, Villareal M, Hershey GKK, Grinshpun SA. A comparison of proximity and land use regression traffic exposure models and wheezing in infants. Environmental Health Perspectives. 2007;115(2):278-284.

Ryan PH, LeMasters G, Biagini J, Bernstein D, Grinshpun SA, Shukla R, Wilson K, Villareal M, Burkle J, Lockey J. Is it traffic type, volume, or distance? Wheezing in infants living near truck and bus traffic. Journal of Allergy and Clinical Immunology. 2005;116:279-284. (Editor’s Choice article)