Farm Dust Regulation Prevention Act of 2011 - Amends the Clean Air Act (CAA) to exempt nuisance dust from the CAA and excludes nuisance dust from references in the CAA to particulate matter, except with respect to geographic areas where such dust is not regulated under state, tribal, or local law to the extent the Administrator finds that: (1) nuisance dust (or any subcategory of nuisance dust) causes substantial adverse public health and welfare effects at ambient concentrations; and (2) the benefits of applying CAA standards and other requirements to such dust outweigh the costs. Defines "nuisance dust" as particulate matter: (1) generated from natural sources, unpaved roads, agricultural activities, earth moving, or other activities typically conducted in rural areas; or (2) consisting primarily of soil, other natural or biological materials, windblown dust, or some combination of such materials.
Prohibits the Administrator of the Environmental Protection Agency (EPA) from proposing, finalizing, implementing, or enforcing any regulation revising the national primary ambient air quality standard or the national secondary ambient air quality standard applicable to particulate matter with an aerodynamic diameter greater than 2.5 micrometers under the CAA for one year.