The traffic volunteer officer spends 6–8 hours daily in contaminated, dusty air environments, inhaling harmful particles through the respiratory tract. Isotonic saline nasal irrigation removes inflammatory mediators and improves mucociliary function. The study aims to investigate the effect of isotonic saline nasal irrigation on mucociliary transport time for traffic volunteer officers in Surakarta, Indonesia. We conducted this experimental study on 51 male traffic volunteer officers in Surakarta who met the inclusion and exclusion criteria, using a one-group pretest-posttest design. The researchers conducted the study at the Surakarta police station. The saccharin test assessed mucociliary transport time before and after two weeks of nasal irrigation with an isotonic saline solution. We used the Kolmogorov-Smirnov test to determine if the data were normal, and employed the Wilcoxon signed-rank test or the paired samples t-test to test the hypothesis. The most common age group was 45–60 (49%), and most traffic volunteer officers had a working period of 6–10 years (47.1%). Before isotonic saline nasal irrigation, traffic volunteer officers' mean mucociliary transport time was 10.67 ± 2.63 minutes. After two weeks of isotonic saline nasal irrigation, the mean value decreased to 7.96 ± 2.16 minutes. The mucociliary transport time has significantly reduced after isotonic saline nasal irrigation (p < 0,001). Isotonic saline nasal irrigation improves mucociliary transport by shortening the time it takes for mucociliary transport in traffic volunteer officers. This makes the nasal mucosa more resistant to inflammatory mediators, irritants, and infectious agents.