A photo of Patrick Ryan.

Patrick H. Ryan, PhD, MS

  • Professor, UC Department of Pediatrics
  • UC Department of Environmental Health



My research involves assessing environmental exposures, particularly air pollutants, and studying how they affect pediatric respiratory health and neurodevelopment. My research primarily involves:

  • Air pollution
  • The built environment including greenspace
  • The use of personal monitors and sensors to measure environmental exposures
  • Environmental asbestos exposure

The goals of my research are to answer the following questions: 1) How do we accurately characterize exposure to environmental pollutants, especially air pollutants; and 2) What is the impact or health effects of environmental exposures, especially air pollutants?

Early in my career, I developed the first land-use regression model of elemental carbon, a traffic-related pollutant. This model has been widely applied and used in the Cincinnati Childhood Allergy and Air Pollution Study (CCAAPS) to assess childhood exposure to traffic-related air pollution with childhood wheezing, asthma onset and other respiratory diseases. More recently, we have linked traffic-related air pollution to childhood mental health, including anxiety and depression.

My focus on air pollution has also led to community-based research to study air quality and local schools, to demonstrate the effectiveness of anti-idling campaigns on improving air quality near schools. In addition, I have collaborated with engineers to develop personal monitors for air pollution, including ultrafine particles. My research group is currently utilizing these personal monitors to measure adolescents’ personal exposure to air pollution and understand how they impact respiratory health.

Other research interests include the identification of environmental, demographic, home and other factors associated with personal exposure to specific elemental constituents of particulate matter and the impact of naturally occurring elongated mineral fibers (e.g. asbestos) on respiratory and autoimmune disease in the western United States.

My research has been supported by local and national organizations, including the National Institutes of Health (NIH), the Centers for Disease Control and Prevention (CDC), the Environmental Protection Agency (EPA) and the Health Effects Institute (HEI). The results of these research efforts have been published in more than 100 peer-reviewed papers.

Locally, I serve on multiple mentoring committees including clinical fellows, K recipients and junior faculty. I also currently serve as the co-director of the MS in Clinical and Translational Research program and the director of Translational Workforce Development for the Center for Clinical and Translational Science and Training at Cincinnati Children’s.

PhD: University of Cincinnati, Cincinnati, OH, 2007.

MS: University of Cincinnati, Cincinnati, OH, 2004.

BS: Xavier University, Cincinnati, OH, 2001.


Environmental epidemiology; air pollution; personal monitors; greenspace; neurodevelopment; respiratory health

Research Areas

Biostatistics and Epidemiology


Development of an undergraduate certificate in clinical and translational science: improving competence of the clinical research workforce. Knapke, J; Marcum, M; Mendell, A; Ryan, P. Frontiers in Pharmacology. 2023; 14:1294534.

Social-environmental phenotypes of rapid cystic fibrosis lung disease progression in adolescents and young adults living in the United States. Palipana, AK; Vancil, A; Gecili, E; Rasnick, E; Ehrlich, D; Pestian, T; Andrinopoulou, ER; Afonso, PM; Keogh, RH; Ni, Y; et al. Environmental Advances. 2023; 14:100449.

Report-Back of Personal Air Sampling Results and Study Participants' Perceived Knowledge, Attitudes, and Awareness of Air Pollution. Ryan, PH; Wolfe, C; Parsons, A; Brokamp, C; Turner, A; Ingram, S; Haynes, E. Environmental Health Perspectives. 2023; 131:117702.

Internal versus External Predictors of Physical Activity in Youth. Ryan, P; Kaskas, M. Journal of Child and Family Studies. 2023; 32:1-13.

622 Hypercubes to identify key environmental exposures predictive of rapid cystic fibrosis lung disease progression. Cheng, Y; Gecili, E; Brokamp, C; Rasnick, E; Ryan, P; Szczesniak, R. Journal of Cystic Fibrosis. 2023; 22:s334.

618 Environmental exposures and spatiotemporal effects that characterize rapid lung function decline in a Midwest U.S. cystic fibrosis cohort. Gecili, E; Brokamp, C; Asar, O; Andrinopoulou, E; Brewington, J; Ryan, P; Szczesniak, R. Journal of Cystic Fibrosis. 2023; 22:s330.

Incidence rates of childhood asthma with recurrent exacerbations in the US Environmental influences on Child Health Outcomes (ECHO) program. Miller, RL; Schuh, H; Chandran, A; Aris, IM; Bendixsen, C; Blossom, J; Breton, C; Camargo, CA; Canino, G; Carroll, KN; et al. Journal of Allergy and Clinical Immunology. 2023; 152:84-93.

Lung function and secondhand smoke exposure among children with cystic fibrosis: A Bayesian meta-analysis. Reifenberg, J; Gecili, E; Pestian, T; Andrinopoulou, ER; Ryan, PH; Brokamp, C; Collaco, JM; Szczesniak, RD. Journal of Cystic Fibrosis. 2023; 22:694-701.

Introducing trainees to research using an online, asynchronous course. Blackard, JT; Knapke, JM; Schuckman, S; Veevers, J; Hardie, WD; Ryan, PH. Journal of Clinical and Translational Science. 2023; 7:e155.

Air pollution exposure and social responsiveness in childhood: The cincinnati combined childhood cohorts. Iyanna, N; Yolton, K; LeMasters, G; Lanphear, BP; Cecil, KM; Schwartz, J; Brokamp, C; Rasnick, E; Xu, Y; MacDougall, MC; et al. International Journal of Hygiene and Environmental Health. 2023; 251:114172.

From the Blog

Asthma and the Legacy of Racism Extends Beyond Poor Neighborhoods
Asthma and Allergy

Asthma and the Legacy of Racism Extends Beyond Poor Neighborhoods

Patrick H. Ryan, PhD, MS5/23/2022

Cincinnati Children’s Supporting Price Hill Air Quality Study
Community Health

Cincinnati Children’s Supporting Price Hill Air Quality Study

Patrick H. Ryan, PhD, MS3/28/2022