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Objective: This correlation descriptive research aimed to investigate the relationship between health literacy and preventive behavior regarding PM 2.5 exposure among pregnant women. Method: The purposive sample included 425 normal pregnant women, aged 20 years or more, who had attended the antenatal clinic at Pathum Thani Hospital, Pathum Thani Province, between May 2021 to April 2022. The research instruments comprised demographic data form, a health literacy questionnaire developed by the researcher using the framework by Nutbeam, and Preventive Behavior Regarding PM 2.5 Exposure Questionnaire of pregnant women. Descriptive statistics and Pearson’s correlation coefficient were used for data analysis. Results: The results showed that the health literacy and preventive behavior of the samples were at a moderate level (M = 3.59, S.D = .57 and M = 3.82, SD = .59, respectively) and health literacy had a positive statistically significant correlation with preventive behavior at a high level (r = .784, p < .001). The results also demonstrated that health literacy is associated with preventive behavior. Thus, the nurse should provide health promotion activities that focus on promoting health literacy to modify health behavior that increases the preventive behavior regarding PM 2.5 exposure among pregnant women.
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