A5077334903- Air Quality and Health Impacts
- Wind and Air Flow Studies
- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Meteorological Phenomena and Simulations
- Aeolian processes and effects
- Fluid Dynamics and Turbulent Flows
- Urban Heat Island Mitigation
- Atmospheric and Environmental Gas Dynamics
- Migration and Labor Dynamics
- Noise Effects and Management
- Migration, Refugees, and Integration
- Atmospheric aerosols and clouds
- Climate Change and Health Impacts
- Sex work and related issues
- Aerodynamics and Fluid Dynamics Research
- Urban Green Space and Health
- Soil erosion and sediment transport
- Cardiovascular Effects of Exercise
- Environmental Policies and Emissions
- Particle Dynamics in Fluid Flows
- Plant Water Relations and Carbon Dynamics
- Building Energy and Comfort Optimization
- Heat Transfer Mechanisms
Cambridge Environmental Research Consultants (United Kingdom)
2012-2022
San Diego State University
2016-2021
New York University
2015-2020
University Medical Center
2019
The University of Texas Southwestern Medical Center
2017-2019
The King's College
2017
Cleveland Clinic
2017
Southwestern Medical Center
2017
MedStar Health
2017
Beth Israel Deaconess Medical Center
2017
Low cost sensors are becoming increasingly available for studying urban air quality. Here we show how such sensors, deployed as a network, provide unprecedented insights into the patterns of pollutant emissions, in this case at London Heathrow Airport (LHR). Measurements from sensor network were used to unequivocally distinguish airport emissions long range transport, and then infer emission indices various activities. These constrain an quality model (ADMS-Airport), creating powerful...
The ‘problems’ associated with analysing different kinds of turbulent flow and methods solution are classified discussed reference to how the structure in a domain depends on scale geometry domain's boundary, information provided boundary conditions. Rapid distortion theory (RDT) is method, based linear analysis, for calculating ‘rapidly changing turbulent’ (RCT) flows under action distortion, such as large-scale velocity gradients, effects bounding surfaces, body forces, etc. Recent...
Abstract. The Atmospheric Pollution and Human Health in a Chinese Megacity (APHH-Beijing) programme is an international collaborative project focusing on understanding the sources, processes health effects of air pollution Beijing megacity. APHH-Beijing brings together leading China UK research groups, state-of-the-art infrastructure quality models to work four themes: (1) sources emissions pollutants; (2) atmospheric affecting urban pollution; (3) exposure impacts; (4) interventions...
The urban heat island (UHI) is a well-known effect of urbanisation and particularly important in world megacities. Overheating such cities expected to be exacerbated the future as result further growth climate change. Demonstrating quantifying impact individual design interventions on UHI currently difficult using available software tools. tools developed LUCID (‘The Development Local Urban Climate Model its Application Intelligent Design Cities’) research project will enable related impacts...
Abstract. A coupled regional-to-local modelling system comprising a regional chemistry–climate model with 5 km horizontal resolution (EMEP4UK) and an urban dispersion chemistry explicit road source emissions (ADMS-Urban) has been used to simulate air quality in 2012 across London. The study makes use of emission factors for NOx NO2 non-exhaust rates PM10 PM2.5 which have adjusted compared standard reflect real-world emissions, increases total around 30 % these species. performance the each...
The potential to capture additional air pollutants by introducing more vegetation or changing existing short woodland on first sight provides an attractive route for lowering urban pollution. Here, atmospheric chemistry and transport model was run with a range of landcover scenarios quantify pollutant removal the total UK as well effect large-scale tree planting whole reduces area (population)-weighted concentrations significantly, 10% (9%) PM 2.5 , 30% (22%) SO 2 24% (19%) NH 3 15% (13%) O...
Abstract Orographic enhancement of rain via the ‘feeder‐seeder’ mechanism has been calculated using a stratified airflow model. The effect wind drift on precipitation included. Comparisons have made potential flow models both in two and three dimensions model M. J. Bader W. T. Roach. For high windspeeds (≥ 15ms −1 ), when large enhancements occur, treatment is sufficient. Inclusion stratification does not significantly affect total washout, although case long hills (half‐length ≥ 10km)...
Velocity fluctuations are calculated near an interface between a turbulent region and stably stratified layer, in the absence of mean shear. Based on observation that energy dissipation rate is finite region, linear theory constructed to match given Eulerian (not Lagrangian) spectra turbulence wave motion stable layer.The shows eddies with frequency same order as buoyancy N layer least affected by stratification. The square vertical velocity when → ∞, while ω2 greatest at NLH/uH ≈ 2 uH LH...
Many countries perform national air quality assessments using grid-based numerical dispersion models, generally referred to as 'regional' models. Advantages of these models include the ability use temporally and spatially varying meteorology model chemical reactions over large temporal spatial scales. These usually reasonably well against rural urban background monitors, but predictions at roadside monitors are underestimated. City-scale have been developed give high resolution, restricted...
Urban form controls the overall aerodynamic roughness of a city, and hence plays significant role in how air flow interacts with urban landscape. This paper reports improved model performance resulting from introduction variable surface operational air-quality ADMS-Urban (v3.1). We then assess to what extent pollutant concentrations can be reduced solely through local reductions roughness. The results suggest that reducing city centre increase ground-level concentrations, both locally area...
Abstract. We examine the street-scale variation of NOx, NO2, O3 and PM2.5 concentrations in Beijing during Atmospheric Pollution Human Health a Chinese Megacity (APHH-China) winter measurement campaign November–December 2016. Simulations are performed using urban air pollution dispersion chemistry model ADMS-Urban an explicit network road source emissions. Two versions gridded Multi-resolution Emission Inventory for China (MEIC v1.3) used: standard MEIC v1.3 emissions optimised version, both...
The steep increase in urban populations results the spatial extent of cities expanding both horizontally and vertically. climatic response areas differs greatly to rural exposed same environmental conditions, with temperatures generally being higher, particularly late afternoon evening. Coupled upward trend global temperatures, heating can be classified as an atmospheric hazard that affects a high proportion population some countries, which needs addressed through local national government...
Abstract. Ambient air pollution poses a major global public health risk. Lower-cost quality sensors (LCSs) are increasingly being explored as tool to understand local problems and develop effective solutions. A barrier LCS adoption is potentially larger measurement uncertainty compared reference technology. The technical performance of various LCSs has been tested in laboratory field environments, growing body literature on uses primarily focuses proof-of-concept deployments. However, few...
ADMS-Urban has been used in approximately half of the pilot studies air pollution recently carried out UK. The areas varied spatial extent and nature sources, balance between traffic, industrial domestic pollutants which are important. local emission inventories, outputs included time-series predicted concentrations could be compared with measured data at monitoring sites, as well contour concentration plots across study area.
Abstract A three‐layer model is presented. This describes the flow on an inversion capped boundary layer over hills of moderate size and slope. The linearized vorticity equation solved using non‐linear conditions. pressure field developed in used to calculate a modified inner region velocity (Jackson Hunt 1975). low level with height I , ≲ 2 h found decrease speed‐up near ground. When ≳ shows increasing tendency be subcritical; this leads much increased speed‐up. Increasing stability air...