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Event detection in wireless sensor networks (WSNs) has attracted much attention due to its importance in many applications.The erroneous abnormal data generated during event detection are prone to lead to false detection results.Therefore,in order to improve the reliability of event detection,we propose a dirty-event cleaning method based on spatio-temporal correlations among sensor data.Unlike traditional fault-tolerant approaches,our method takes into account the inherent uncertainty of sensor measurements and focuses on the type of directional events.A probabilitybased mapping scheme is introduced,which maps uncertain sensor data into binary data.Moreover,we give formulated definitions of transient dirty-event (TDE) and permanent dirty-event (PDE),which are cleaned by a novel fuzzy method and a collaborative cleaning scheme,respectively.Extensive experimental results show the effectiveness of our dirty-event cleaning method.