Ryan W. Allen









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The Ulaanbaatar Gestation and Air Pollution Research (UGAAR) study is being conducted in Ulaanbaatar, Mongolia, one of the world's most polluted cities.   This randomized controlled trial is designed to investigate the impacts of air pollution exposure during pregnancy on fetal growth and childhood development and the potential for portable air purifiers to reduce those impacts.


Canadian Institutes of Health Research

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The objectives of this Vancouver-based study were to: 1) quantify the relationship between low-level exposures to combustion-derived PM air pollution and subclinical indicators of cardiovascular disease risk; 2) evaluate the impact of HEPA filters on reductions in exposure and measurable improvements in sensitive subclinical cardiovascular health indicators among healthy adult participants; and 3) compare the relative impact of HEPA filtration for two major PM sources (traffic and residential wood combustion) on these indicators.

FUNDING: Canadian Institutes of Health Research

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Woodstove Exchange Study
WEST was a series of linked projects to assess the impacts of a stove exchange program in the Bulkley Valley Lakes District (BVLD) of BC on community air quality and to investigate the potential improvements in health arising from the change to certified wood stoves.

BC Lung Association, BC Ministry of Environment, Health Canada

PUBLICATIONS (click to view)



Air pollution and atherosclerosis
Gan WQ, Allen RW, Brauer M, Davies HW, Mancini GBJ, and Lear SA. Long-Term Exposure to Traffic-Related Air Pollution and Progression of Carotid Artery Atherosclerosis: A Prospective Cohort Study. BMJ Open, 2014, 4, e004743.

Gill EA, Curl CL, Adar SD, Allen RW, Auchincloss AH, O’Neill MS, Park SK, Van Hee VC, Diez Roux AV, and Kaufman JD.  Air Pollution and Cardiovascular Disease in the Multi-Ethnic Study of Atherosclerosis.  Progress in Cardiovascular Diseases, 2011, 53, 353-360.

Allen RW, Criqui MH, Diez Roux AV, Allison M, Shea S, Detrano R, Sheppard L, Wong N, Hinckley Stukovsky K, and Kaufman JD.  Fine Particulate Matter Air Pollution, Proximity to Traffic, and Aortic Atherosclerosis.  Epidemiology, 2009, 20, 254-264.
Modeling spatial patterns of traffic-related air pollution
Tang R, Tian L, Thach T-Q, Tsui TH, Brauer M, Lee M, Allen R, Yuchi W, Lai P-C, Wong P, and Barratt B.  Integrating Travel Behavior with Land Use Regression to Estimate Dynamic Air Pollution Exposure in Hong Kong. Environment International, 2018, 113, 100-108.

Lee M, Brauer M, Wong P, Tang R, Tsui TH, Choi C, Cheng J, Lai PC, Tian L, Thach TQ, Allen RW, and Barratt B. Land Use Regression Modelling of Air Pollution in High-density High-rise Cities: A Case Study in Hong Kong.  Science of the Total Environment, 2017, 592, 306-315.

Abernethy RC, Allen RW, McKendry IG, and Brauer M. A Land Use Regression Model for Ultrafine Particles in Vancouver, Canada. Environmental Science & Technology, 2013, 47, 5217-5225.

Wang R, Henderson SB, Sbihi H, Allen RW, and Brauer M.  Temporal Stability of Land Use Regression Models for Traffic-Related Air Pollution.  Atmospheric Environment, 2013, 64, 312-319.

Allen RW, Amram O, Wheeler AJ, and Brauer M.  The Transferability of NO and NO2 Land Use Regression Models Between Cities and Pollutants.  Atmospheric Environment, 2011, 45, 369-378.

Mercer LD, Szpiro AA, Sheppard L, Lindstrom J, Adar SD, Allen RW, Avol E, Oron AP, Larson T, Liu LJ-S, Kaufman JD.  Comparing Universal Kriging and Land-use Regression for Predicting Concentrations of Gaseous Oxides of Nitrogen (NOx) for the Multi-Ethnic Study of Atherosclerosis and Air Pollution (MESA Air).  Atmospheric Environment, 2011, 45, 4412-4420.

Poplawski K, Gould T, Setton E, Allen R, Su J, Larson T, Henderson S, Brauer M, Hystad P, Lightowlers C, Keller P, Cohen M, Silva C, and Buzzelli M.  Intercity Transferability of Land Use Regression Models for Estimating Ambient Concentrations of Nitrogen Dioxide.  Journal of Exposure Science & Environmental Epidemiology, 2009, 19, 107-117.

Noise exposure
Allen RW and Adar SD.  Are both air pollution and noise driving adverse cardiovascular health effects from motor vehicles?  Environmental Research, 2011, 111, 184-185.

Allen RW, Davies H, Cohen MA, Mallach G, Kaufman JD, and Adar SD.  The Spatial Relationship between Traffic-Generated Air Pollution and Noise in 2 U.S. Cities.  Environmental Research, 2009, 109, 334-342.
Estimation of pollution infiltration into residences
Allen RW, Adar SD, Avol E, Cohen M, Curl CL, Larson T, Liu L-JS, Sheppard L, and Kaufman J.  Modeling  the Residential Infiltration of Outdoor PM2.5 in the Multi-Ethnic Study of Atherosclerosis and Air Pollution (MESA Air). Environmental Health Perspectives, 2012, 120, 824-830.

MacNeill M, Wallace L, Kearney J, Allen RW, Van Ryswyk K, Judek S, Xu X, and Wheeler A. Factors Influencing Variability in the Infiltration of PM2.5 Mass and its Components. Atmospheric Environment, 2012, 61, 518-532.

Clark NA, Allen RW, Hystad P, Wallace L, Dabek E, and Wheeler A.  Exploring Variation and Predictors of Residential PM2.5 Infiltration.  International Journal of Environmental Research and Public Health, 2010, 7, 3211-3224.

Hystad P, Setton EM, Allen RW, Keller PC, and Brauer M.  Modeling Residential Fine Particulate Matter Infiltration for Exposure Assessment.  Journal of Exposure Science & Environmental Epidemiology, 2009, 19, 570-579.

Allen R, Wallace L, Sheppard L, Larson T, and Liu L-JS.  Evaluation of the Recursive Model Approach for Estimating Residential Particle Infiltration Efficiencies from Light Scattering Data.  Journal of Exposure Science & Environmental Epidemiology, 2007, 17, 468-477.

Allen R, Larson T, Sheppard L, Wallace L, and Liu L-JS. Use of Real-Time Light Scattering Data to Estimate the Contribution of Infiltrated and Indoor-Generated Particles to Indoor Air. Environmental Science & Technology. 2003, 37, 3484-3492. 

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Ryan Allen 2018