1. A computer-implemented method comprising: receiving speech data corresponding to an utterance spoken in a particular noise environment; for each of a plurality of noise environments that are different than the particular noise environment: combining the speech data with stored noise data that is associated with the noise environment of the plurality of noise environments, to generate noise-specific, training audio data, and training a noise-specific, speech recognition model based at least on the noise-specific, training audio data; and providing the respective, noise-specific, speech recognition models associated with each of the plurality of noise environments, for output.