1. A smoke detector, comprising: a computer readable medium including linear discriminant analysis (LDA) training output data generated by: inputting sensor data from a plurality of tests, the sensor data indicative of environmental conditions during the respective tests; processing the sensor data to generate derived signal data for the respective tests; assigning at least one group to the derived signal data for the respective tests, the at least one group selected from a plurality of groups, each group of the plurality of groups associated with a hazardous condition or a non-hazardous condition; and performing LDA training using the derived signal data and the assigned at least one group for the respective tests as input to the LDA training, the output of the LDA training generating a plurality of transformation coefficients for transforming derived signal data into linear discriminant (LD) coordinates, a mean of group means, and a plurality of centroids in linear discriminant coordinates, wherein the plurality of centroids includes a different centroid for each group of the plurality of groups; a plurality of sensors configured to observe present environmental conditions, the plurality of sensors comprising an aerosol sensor and a carbon monoxide sensor; a processor operatively connected to the computer readable memory and the plurality of sensors, the processor configured to: process data from the plurality of sensors to provide data in a plurality of data channels indicative of the present environmental conditions; map the data from the plurality of data channels into linear discriminant space using the plurality of transformation coefficients stored in the computer readable medium; classify the present environmental conditions as belonging to one group of the plurality of groups based on the linear discriminant mapping of the data from the plurality of data channels; and signal an alarm condition if the present environmental conditions are classified as belonging to a group associated with a hazardous condition; and an alarm operatively connected to the processor, the alarm generating an audible alert, a visual alert, or a combination thereof in response to the alarm signal.