Three bioindicator plant species—Psidium cattleianum Sabine, Lolium multiflorum Lam., and Mangifera indica L.—were referenced for a study on morphophysiological and anatomical changes resulting from atmospheric NO_x and SO₂ emissions from magnesite processing by a mining industry in Brumado city, Brazil. Species were pot-grown in the field, for 9‒11 months, in the following locations: (1) full-time exposure to NO_x and SO₂ emissions and (2) free of the pollutant plume influence (reference area). Pollutant plume reduced plant height, except in M. indica. Total leaf area, leaf amount, and dry mass of leaf, stem, and root were lower in P. cattleianum and L. multiflorum, and higher in M. indica, except for stem and root dry mass, where there was no difference between treatments. Chlorophyll content reduced in P. cattleianum, showing chlorosis and necrosis, but it was not affected in L. multiflorum and M. indica. Soluble sugar content was not affected in all species. Starch content was higher in P. cattleianum, unchanged in L. multiflorum, and lower in M. indica. Pollutant plume induced higher stomatal frequency, and some deformities and irregular shapes in M. indica. Amorphous material-clogged ostioles in leaf stomata were mainly found in P. cattleianum. Thickening of the adaxial epidermis, palisade parenchyma, and mesophyll were observed in P. cattleianum. In M. indica, only epidermis thickening was observed. In L. multiflorum, mesophyll thickness was smaller under pollutant plume. We concluded that atmospheric NO_x and SO₂ emissions negatively affected growth-related morphophysiological and anatomic features at different levels, depending on the species.