We find evidence that firms engage in earnings management to potentially diminish environmental regulatory attention after the implementation of an automatic air pollutant monitoring system in China. Polluting firms increase their use of discretionary accruals and reduce the informativeness of earnings, compared to non-polluting firms. Polluting firms that are larger, more profitable, located near monitoring stations, and situated in less market-oriented regions exhibit heightened earnings management, consistent with the greater environmental regulatory exposure these firms face. The behavior is moderated by stronger customer-supplier relationships and lower market competition, when the cost of earnings management is higher. Our findings highlight the conflict between environmental and governance issues.