Professor William Bloss PhD

William Bloss

School of Geography, Earth and Environmental Sciences
Professor of Atmospheric Science
Deputy Head, College of Life & Environmental Sciences

Contact details

School of Geography, Earth and Environmental Sciences
University of Birmingham
B15 2TT

Atmospheric processing affects the current and future composition of our air, with impacts upon human and environmental health, air quality and climate.

My group's work improves scientific understanding of the causes of poor air quality, and hence the development of effective policy measures for Clean Air.  We focus upon the sources of atmospheric pollutants, and the chemical processes which remove some air pollutants and produce others.

Please see my Personal Research Pages and the WM-Air project for more details.


  • PhD Atmospheric Chemistry - University of Cambridge
  • BA Natural Sciences (Chemistry) - University of Cambridge


BSc Environmental Sciences

MSc Air Pollution Management and Control

Postgraduate supervision

Please contact me if you are interested in studying for a PhD with the group. For more information see my personal research pages at :


Atmospheric processing affects the current and future composition of our air, with impacts upon human and environmental health, air quality and climate.  My research group addresses areas of atmospheric chemistry and clean air science, including

- Understanding the sources and transformations of air pollutants in the urban atmosphere, ranging from trends in the UK to developing megacities such as Delhi

- Quantifying the sources and sinks for atmospheric oxidants: impacts from processes such as new reactive nitrogen emissions and particulate-mediated renoxification

- Applying air pollution science to improve local and regional air quality policy measures

Our work combines atmospheric field measurements, simulation chamber and laboratory studies and numerical modelling approaches.  Fundamental understanding of the atmospheric chemical system is placed in an applied context: working with partners to apply clean air science for improved human and environmental health.

See also my personal research pages and the WM-Air Project

Other activities

  • Clean Air Advisory Panel for Wales
  • Strategic Advisory Board, RESAS Scotland
  • Royal Society of Chemistry: CChem, FRSC
  • RSC Environmental Chemistry Group (Chair, 2012 – 2014)
  • Head of School, GEES (2016-2020)


Recent publications


Liu, B, Bryson, JR, Sevinc, D, Cole, M, Elliott, R, Bartington, S, Bloss, W & Shi, Z 2023, 'Assessing the Impacts of Birmingham’s Clean Air Zone on Air Quality: Estimates from a Machine Learning and Synthetic Control Approach', Environmental and Resource Economics, vol. 86, no. 1-2, pp. 203-231.,

Cho, C, Fuchs, H, Hofzumahaus, A, Holland, F, Bloss, WJ, Bohn, B, Dorn, HP, Glowania, M, Hohaus, T, Liu, L, Monks, PS, Niether, D, Rohrer, F, Sommariva, R, Tan, Z, Tillmann, R, Kiendler-Scharr, A, Wahner, A & Novelli, A 2023, 'Experimental chemical budgets of OH, HO2, and RO2 radicals in rural air in western Germany during the JULIAC campaign 2019', Atmospheric Chemistry and Physics, vol. 23, no. 3, pp. 2003-2033.

Molden, N, Hemming, C, Leach, F, Levine, JG, Ropkins, K & Bloss, W 2023, 'Exposures to Particles and Volatile Organic Compounds across Multiple Transportation Modes', Sustainability (Switzerland), vol. 15, no. 5, 4005.

Andersen, ST, Carpenter, LJ, Reed, C, Lee, JD, Chance, R, Sherwen, T, Vaughan, AR, Stewart, J, Edwards, PM, Bloss, WJ, Sommariva, R, Crilley, LR, Nott, GJ, Neves, L, Read, K, Heard, DE, Seakins, PW, Whalley, LK, Boustead, GA, Fleming, LT, Stone, D & Fomba, KW 2023, 'Extensive field evidence for the release of HONO from the photolysis of nitrate aerosols', Science Advances, vol. 9, no. 3, eadd6266.

Nelson, BS, Bryant, DJ, Alam, MS, Sommariva, R, Bloss, WJ, Newland, MJ, Drysdale, WS, Vaughan, AR, Acton, WJF, Hewitt, CN, Crilley, LR, Swift, SJ, Edwards, PM, Lewis, AC, Langford, B, Nemitz, E, Shivani, Gadi, R, Gurjar, BR, Heard, DE, Whalley, LK, Şahin, UA, Beddows, DCS, Hopkins, JR, Lee, JD, Rickard, AR & Hamilton, JF 2023, 'Extreme Concentrations of Nitric Oxide Control Daytime Oxidation and Quench Nocturnal Oxidation Chemistry in Delhi during Highly Polluted Episodes', Environmental Science and Technology Letters, vol. 10, no. 6, pp. 520-527.

Dyson, JE, Whalley, LK, Slater, EJ, Woodward-Massey, R, Ye, C, Lee, JD, Squires, F, Hopkins, JR, Dunmore, RE, Shaw, M, Hamilton, JF, Lewis, AC, Worrall, SD, Bacak, A, Mehra, A, Bannan, TJ, Coe, H, Percival, CJ, Ouyang, B, Hewitt, CN, Jones, RL, Crilley, LR, Kramer, LJ, Acton, WJF, Bloss, WJ, Saksakulkrai, S, Xu, J, Shi, Z, Harrison, RM, Kotthaus, S, Grimmond, S, Sun, Y, Xu, W, Yue, S, Wei, L, Fu, P, Wang, X, Arnold, SR & Heard, DE 2023, 'Impact of HO2 aerosol uptake on radical levels and O3 production during summertime in Beijing', Atmospheric Chemistry and Physics, vol. 23, no. 10, pp. 5679-5697.

Zhong, J, Hodgson, JR, Bloss, W & Shi, Z 2023, 'Impacts of net zero policies on air quality in a metropolitan area of the United Kingdom: Towards world health organization air quality guidelines', Environmental Research, vol. 236, 116704.

Matthaios, VN, Harrison, RM, Koutrakis, P & Bloss, WJ 2023, 'In-vehicle exposure to NO2 and PM2.5: A comprehensive assessment of controlling parameters and reduction strategies to minimise personal exposure', Science of the Total Environment, vol. 900, 165537.

Matthaios, VN, Rooney, D, Harrison, RM, Koutrakis, P & Bloss, WJ 2023, 'NO2 levels inside vehicle cabins with pollen and activated carbon filters: A real world targeted intervention to estimate NO2 exposure reduction potential', Science of the Total Environment, vol. 860, 160395.

Alwadei, M, Srivastava, D, Alam, MS, Shi, Z & Bloss, WJ 2022, 'Chemical characteristics and source apportionment of particulate matter (PM2.5) in Dammam, Saudi Arabia: impact of dust storms', Atmospheric Environment: X, vol. 14, 100164.

Simpson, O, Elliott, M, Muller, C, Jones, T, Hentsch, P, Rooney, D, Cowell, N, Bloss, W & Bartington, S 2022, 'Evaluating actions to improve air quality at University Hospitals Birmingham NHS Foundation Trust', Sustainability, vol. 14, no. 18, 11128.

Guo, Y, Li, K, Zhao, B, Shen, J, Bloss, WJ, Azzi, M & Zhang, Y 2022, 'Evaluating the real changes of air quality due to clean air actions using a machine learning technique: results from 12 Chinese mega-cities during 2013–2020', Chemosphere, vol. 300, 134608.

Cowell, N, Chapman, L, Bloss, W & Pope, F 2022, 'Field Calibration and Evaluation of an Internet-of-Things-Based Particulate Matter Sensor', Frontiers in Environmental Science, vol. 9, 798485.

Singh, A, Bartington, SE, Song, C, Ghaffarpasand, O, Kraftl, M, Shi, Z, Pope, FD, Stacey, B, Hall, J, Thomas, GN, Bloss, WJ & Leach, FCP 2022, 'Impacts of emergency health protection measures upon air quality, traffic and public health: evidence from Oxford, UK', Environmental Pollution, vol. 293, 118584.

Conference contribution

Zhong, J, Hood, C, Johnson, K, Stocker, J, Handley, J, Wolstencroft, M, Mazzeo, A, Cai, X & Bloss, WJ 2023, Modelling Street-Scale Resolution Air Quality for the West Midlands (UK) Using the ADMS-Urban RML System. in C Mensink & O Jorba (eds), Air Pollution Modeling and its Application XXVIII. 1 edn, Springer Proceedings in Complexity, Springer, pp. 77-82, ITM 2021, Barcelona, Spain, 18/10/21.

View all publications in research portal


Air Quality & Human Health

Sources of air pollutants: Traffic emissions

Air Pollution in Developing Megacities: Beijing, Delhi


Air Quality & Human Health; Sources of air pollutants: Traffic emissions; Air Pollution in Developing Megacities: Beijing, Delhi