Air Pollutant Distribution in Selected Wood-Fired Bakeries in Calabar Metropolis: Implications for Occupational Health
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Wood-fired bakery operations may generate particulate and gaseous pollutants that affect workplace air quality. This study assessed air pollutant distribution in selected wood-fired bakeries in Calabar metropolis, Cross River State, Nigeria. The objectives were to measure selected air pollutants, evaluate differences in measured values in comparison with NESREA/WHO standards among selected bakeries, and discuss potential occupational health relevance of the findings. Six (6) bakeries were selected within Calabar metropolis. Measurements were obtained using a portable multiparameter air quality detector. Measured parameters included PM₂.₅, PM₁₀, carbon dioxide (CO₂), formaldehyde (HCHO), total volatile organic compounds (VOCs), temperature, and relative humidity. Readings at each point were taken for 8hours. Descriptive statistics were calculated, and exploratory one-way analyses of variance were reported to compare mean values for the six bakeries. Bakery-level means ranged from 14.33 to 52.33 µg/m³ for PM₂.₅, 20.33 to 74.33 µg/m³ for PM₁₀, 549.33 to 1,099.67 ppm for CO₂, 0.025 to 0.310 mg/m³ for HCHO, and 0.102 to 1.112 mg/m³ for VOCs. Mean temperature ranged from 32.00 to 38.00 °C and relative humidity from 59.33% to 60.33%. Bakery B1 had the highest means for PM₂.₅, PM₁₀, CO₂ and VOCs, while B5 had the highest mean HCHO concentration. The exploratory ANOVA indicated a difference in CO₂ among bakeries (F = 3.119, p = 0.049), while other comparisons were not statistically significant at α = 0.05. The findings identify variability in measured air quality and recommends improved ventilation, dust control, oven maintenance and more rigorous repeated monitoring.
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Adem, R., Kayhan, M. & Topal, E. (2024). Determination of the Prevalence of Asthma and Asthma Symptoms in Bakery Workers in Malatya. Annals of Medical Research, 0,1. https://doi.org/10.5455/annalsmedres.2024.08.170
Atsa, J. W. U., Abang, R. I., & Abang, D. A (2025). Assessment of Waste Disposal Practices Among Business Operators in Calabar, Nigeria. Gombe Journal of Geography and Environmental Studies (GOJGES) 4(3),139-151. e-ISSN: 2714-321X. p-ISSN: 2714-32. http://www.gojgesjournal.com
Jamwal, L., Sharma, R. & Kaushal, S.(2025). Prevalence of Respiratory Symptoms Among Brick Kiln Workers in Baddi (Himachal Pradesh) & Kalka (Haryana). Archives of Environmental and Occupational Health. https://doi/abs/10.1080/19338244.2025.2605087
Konan, L.L., Essis, E.M.L., Cherif, I.S., Yavo, W., & Tiembre, I. (2026). Respiratory Symptoms and Lung Function Impairment Among Bakery Employees Exposed to Flour Dust in Abidjan, Côte d'Ivoire. Scientific reports. https://doi.org/10.1038/s41598-026-6029-6
National Environmental Standards and Regulation Enforcement Agency (2021). National Environmental (Air Quality Control) Regulations,2021. Schedule IV/XI Federal Republic of Nigeria.
Obiezi, S. C., Ejiogu, C. C., & Verla, E. N. (2023). Assessment and characterization of indoor and outdoor air quality of selected facilities in a university environment using different fuel sources. Global Research in Environment and Sustainability, 1(9), 53–71.
Odunlami, O., Emekekwue, C., Elehinaje, F., Fajobi, M. & Abioye, O. (2021). Assessment of Carbon Monoxide Emission Levels on the Floor of Some Selected Bakeries in Southwestern Nigeria. Proceedings of The World Congress on Engineering. WCE 2021, July 7-9. London, U.K. ISBN:978-988-14049-2-3
Oko-Ose, J. N., & Oko-Ose, O. H. (2024). Analysis of particulate matter and respiratory symptoms of bakery workers in a tertiary educational institution in South-South Nigeria. GPH-International Journal of Biological & Medicine Science, 7(10), 1–9. https://doi.org/10.5281/zenodo.14050050
Pili, S., Muru, A., Lachowicz, J. I., Milia, S., Pedrazzi, T., De Palma, G., Campagna, M., & Lecca, L.I. (2026). Occupational Exposure to Ultrafine Particles (Ufps) in Pizzerias: Personal Monitoring and Comparison of Oven Technologies, Environments, 13(7), 403. https://doi.org/10.3390/environments13070403
Pocock, D., Hall, S., Bennett, S., Darnton, L., & Molloy, M. (2023). Laboratory study of the effectiveness of substituting traditional wheat flour with low-dust flour and use of different sieve designs as controls to reduce exposure to inhalable flour dust in commercial bakeries. Annals of Work Exposures and Health, 67(9), 1081–1087. (OUP Academic)
Sakwe, A., & Gbeinzi, E. (2023). Investigation of particulate matter (PM₁₀ & PM₂.₅) and gaseous pollutants (CO₂ & CO) in houses using kerosene cooking stoves & wood fire in Attisa 3, Bayelsa State, Nigeria. NIPES Journal of Science and Technology Research, 5(2). https://doi.org/10.5281/zenodo.8014409
World Health Organization (2015). WHO Residential Heating with Wood and Coal: Health Impacts and Policy Options in Europe and North America. Copenhagen, Denmark, 2015
World Health Organization. (2021). WHO global air quality guidelines: Particulate matter (PM₂.₅ and PM₁₀), ozone, nitrogen dioxide, sulfur dioxide and carbon monoxide. Geneva: WHO. (World Health Organization) https://www.who.int/publicatios/i/item/9789240034228