We present multiband photometry obtained with the Advanced Camera for Surveys on board the Hubble Space Telescope of four fields in the disk of M33. By studying the positions in the color magnitude diagrams of the most massive main sequence stars and examining the colors of the red giant branches we derive the maximum ages for the youngest stars in each field and make an initial estimate the metallicity gradient across the four fields. We also combine near UV photometry of individual stars in each field obtained with the Wide Field Planetary Camera 2 to make reddening maps of the four fields. We examine whether there is any correlation between the observed reddening and HI maps of the fields.