At the national level, average exposure to NOX and PM2.5 vehicle emissions varies significantly across different types of vehicle traffic. On an average day, the average person is exposed to 102,000 g/km² of NOX from LDVs, 37,400 g/km² from MDVs, and 50,900 g/km² from HDVs (Figure and Table .3). Similarly, for PM2.5 emissions, the respective exposures are 3,010 g/km² from LDVs, 1,500 g/km² from MDVs, and 1,550 g/km² from HDVs (Figure S.2 and Table .3). These exposure values are depicted in Figure (for NOX) and Figure S.2 (for PM2.5), with detailed numerical data available in Table .3.