en Environmental pollution Original articles <div style="text-align: justify;"><strong><em>Introduction:</em></strong> High concentration of inhalable airborne particles can increase the risk of lung disease in exposed people. This study aimed to determine the respirable particulate matter (PM₅) concentration in traditional bakeries of Saveh in 2020.<br> <strong><em>Materials and Methods:</em></strong> This cross-sectional descriptive study was conducted among 25 bakeries where the samples were collected by cyclone and teflon filter equipped by air sampling pump. Later, the respirable particulate matter concentration was measured using gravimetric method. The collected PM₅ was scanned using a FTIR (Fourier-transform infrared spectroscopy) with regard to flour dust. In addition, size and shape of the collected PM₅ were analyzed using a scanning electron microscope (SEM).<br> <strong><em>Results:</em></strong> Findings showed that the Lavash bakery had the highest PM₅ concentration (9.15 mg/m³) in comparison with two other bakeries (Sangak and Barbari). However, an inverse relationship was observed between RH and particle concentration. In addition, the results demonstrated that increasing RH decreased the particle concentration, but the relationship was not significant<br> (P = 0.052, Spearman&#39;s rho = -0.393). Furthermore, Lavash bakery had the lowest average size of PM₅ (0.63 &plusmn; 0.32 &mu;m). However, the FTIR scans confirmed that the flour dust had the predominant amount of PM_5.<br> <strong><em>Conclusion:</em></strong> Based on the findings, the density of respirable PM₅ has a high level in Saveh bakeries and workers&nbsp; are exposed to high levels of PM.</div> Respirable Particulate Matter, Bakery, Indoor Air, Saveh City. 1035 1042 http://jehsd.ssu.ac.ir/browse.php?a_code=A-10-212-1&slc_lang=en&sid=1 Edris Hoseinzadeh edris-2009@live.com 0000-0002-0674-281X No Student Research Committee, Saveh University of Medical Sciences, Saveh, Iran. Mehrzad Ghorbani 0000-0001-8278-9364 No Department of Statistics, College of Basic Sciences, Yadegar-e-Imam Khomeini (RAH) Shahr-e-Rey Branch, Islamic Azad University, Tehran, Iran. Mahdi safari 0000-0003-0347-9283 No Department of Statistics, College of Basic Sciences, Yadegar-e-Imam Khomeini (RAH) Shahr-e-Rey Branch, Islamic Azad University, Tehran, Iran. Najmeh Ebrahimi 0000-0002-3581-1140 Yes Student Research Committee, Saveh University of Medical Sciences, Saveh, Iran.