This meta-analysis addresses a similar question. "Our findings indicate that, across ten trials enrolling 604 participants, personal air cleaners are associated with a significant decrease in systolic blood pressure." pmc.ncbi.nlm.nih.gov/articles/PMC...
"Long-term exposure to PM2.5 is associated with higher blood pressure and increased risk of hypertension prevalence. The effects of PM2.5 on hypertension prevalence become more pronounced at higher PM2.5 levels." bmjopen.bmj.com/content/11/1...
www.washington.edu/news/2023/11... Small (n = 16) randomized crossover trial of passenger car HEPA filtration versus unfiltered air in passenger cabin and blood pressure study linked in article: bmjopen.bmj.com/content/11/1...
"In this study of 347 adults in 3 Detroit communities, short-term increases in exposure to PM2.5 levels... were significantly associated with an increase in systolic and pulse pressures." www.ahajournals.org/doi/10.1161/...
"... short‐term exposure to particulate matter with diameter ≤10 μm and long‐term exposure to NOx, particulate matter with diameter ≤10 μm and particulate matter with diameter ≤2.5 μm were significantly associated with elevated blood pressure values." www.ahajournals.org/doi/10.1161/...