LONDON—A British government report about fracking, which concluded that the method of shale oil or gas extraction increases air pollution, was left unpublished for three years and was only made public just four days after the firm Cuadrilla was given the go-ahead to start the practice in Lancashire.
The report was written by the Air Quality Expert Group and seen by lawmakers in 2015, but only published on July 27, after Cuadrilla was given a permit to start fracking on July 24.
