A method for detecting that a hazardous condition is easing, the method comprising: measuring, by a hazard detector, a first amount of the hazardous condition present in an ambient environment of the hazard detector, said first amount exceeding a first threshold, indicating a pre-alarm level of the hazardous condition, and being less than a second threshold, indicating an alarm level of the hazardous condition, the hazardous condition being selected from the group consisting of smoke and carbon monoxide; setting, by the hazard detector, a mode of the hazard detector to a pre-alarm state indicative of the hazardous condition being present in the ambient environment of the hazard detector; measuring, by the hazard detector, a second amount of the hazardous condition present in the ambient environment of the hazard detector, the second amount of the hazardous condition being less than the first amount of the hazardous condition; determining, by the hazard detector, that the second amount of the hazardous condition present in the ambient environment of the hazard detector is below a threshold hazardous condition level while the mode of the hazard detector is set to the pre-alarm state indicative of the hazardous condition being present; tracking, by the hazard detector, a time period during which the amount of the hazardous condition present in the ambient environment of the hazard detector has remained below the threshold hazardous condition level while the mode of the hazard detector is set to the pre-alarm state indicative of the hazardous condition being present; determining, by the hazard detector, that the time period has reached at least a threshold duration, during such time period the amount of the hazardous condition present in the ambient environment of the hazard detector having remained below the threshold hazardous condition level while the mode of the hazard detector is set to the pre-alarm state indicative of the hazardous condition being present; and outputting, by the hazard detector, an indication of the hazardous condition easing in response to the time period being at least the threshold duration. measuring, by a hazard detector, a first amount of the hazardous condition present in an ambient environment of the hazard detector, said first amount exceeding a first threshold, indicating a pre-alarm level of the hazardous condition, and being less than a second threshold, indicating an alarm level of the hazardous condition, the hazardous condition being selected from the group consisting of smoke and carbon monoxide; setting, by the hazard detector, a mode of the hazard detector to a pre-alarm state indicative of the hazardous condition being present in the ambient environment of the hazard detector; measuring, by the hazard detector, a second amount of the hazardous condition present in the ambient environment of the hazard detector, the second amount of the hazardous condition being less than the first amount of the hazardous condition; determining, by the hazard detector, that the second amount of the hazardous condition present in the ambient environment of the hazard detector is below a threshold hazardous condition level while the mode of the hazard detector is set to the pre-alarm state indicative of the hazardous condition being present; tracking, by the hazard detector, a time period during which the amount of the hazardous condition present in the ambient environment of the hazard detector has remained below the threshold hazardous condition level while the mode of the hazard detector is set to the pre-alarm state indicative of the hazardous condition being present; determining, by the hazard detector, that the time period has reached at least a threshold duration, during such time period the amount of the hazardous condition present in the ambient environment of the hazard detector having remained below the threshold hazardous condition level while the mode of the hazard detector is set to the pre-alarm state indicative of the hazardous condition being present; and outputting, by the hazard detector, an indication of the hazardous condition easing in response to the time period being at least the threshold duration.