 DRIIVE Data and Research on Interventions to Improve the Vehicular Environment is a community-engaged translational pilot project that will utilize a three parallel arm design to obtain preliminary data on associations between Particulate Matter PMair pollution and physiologic measurements and biomarkers in taxi drivers, and to determine the impact of a HEPA filter to remove PM and volatile organic compounds intervention on such physiologic measurements and biomarkers. DRIIVE is funded by the New York State Department of Health Empire Clinical Research Investigator Program ECRIP, which trains physicians in clinical research in New York. Drivers will be randomized to one of two groups: Intervention or Wait-list Control. The third group will be a Matched Nominated Peer Comparison Group, non-drivers who will participate in the same PM and physiologic and biomarker measurements and will serve as a control for non-driving related PM exposure and physiologic response. In total, three groups of 14 participants will be recruited: 1 Wait List Control group, who will receive a HEPA filter at the end of the 1 month participation period, 2 Intervention group, who will receive a HEPA filter two weeks into their participation period, and 3 PM reference group of peer non-drivers, who will also receive a HEPA filter at the end of the 1 month period of participation. The project will be completed within a 2 year timeframe. 