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Wolfson Institute of Population Health

Dr Hajar Hajmohammadi, BSc, MSc, PhD


Senior Data Analyst



I completed my BSc. and MSc. in Civil engineering before beginning a PhD in Transport Studies at University College London (UCL) in 2015, where I was awarded a full scholarship from the Lloyds’ Register Foundation (LRF). In my doctoral dissertation, I developed a novel microscopic vehicle emissions model to estimate tailpipe emission at each second of driving based on the vehicle’s speed and acceleration.  I continued my research at UCL as a research fellow in Transport and Air quality after graduating in 2019. My researches focused on state-space modelling for urban air quality and quantifying the impacts of Ultra Low emission zone (ULEZ) on London air quality. In Sep. 2020, I joined Queen Mary University of London (QMUL) as a Senior Data Analyst. I am responsible for data extraction from medical information systems, data management and analysis, statistical modelling and presenting the analysis and findings to the senior management team. I was awarded two research grants from the National Institute for Health and Care Research (NIHR) in May 2021 and June 2022. I am the Principle Investigator for these projects, which aim to understand the relationship between air pollution exposures and health. Additionally, I am a Co-Investigator on a larger project that is funded by the Health Effects Institute (HEI) and focuses on understanding the impact of non-tailpipe vehicle emissions on human health.

My plan for future research is to define multidisciplinary projects in the areas of Transport, Environment and Public health.  


Research Interests:

Statistical Modelling and Data Analysis

Air Pollution and Health

Transport Studies 


Key Publications

Hajmohammadi, H., Marra, G., Heydecker, B.G., “Data-Driven Models for Microscopic Vehicle Emissions”, Journal of Transportation Research part D: Transport and Environment, Vol. 76, Oct. 2019, Pages 138-154.

Hajmohammadi, H., Marra, G., Heydecker, B.G., “Nonlinear Vehicle Emission Modelling for Urban Areas”, Transportation, Air Quality, and Health Symposium (CARTEEH), Texas A&M trans-portation institute, Texas, Austin, Feb. 2019.

Hajmohammadi, H., Heydecker, B.G., “A Gear-Based Vehicle Emission Model for CO2, CO and NOx Estimation”, Mathematics Applied in Transport and Traffic Systems (MATTS) Conference, TU Delft, Netherland, Oct. 2018.

Hajmohammadi, H., Afandizadeh Sh., Kalantari, N., “Application of Genetic Algorithm for Co-ordinating Variable Speed Limits and Ramp Metering”, Journal of Transportation Research, Vol. 9, No. 3, 2012.

Hajmohammadi, H., Afandizadeh Sh., Kalantari, N., “Study and Assessment of Methods of Co-ordinating Ramp Metering and Variable Speed Limit”, Journal of Traffic Engineering, Vol. 12, No. 46, 2012.

All Publications

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