A chemical detection system for detecting chemicals entrained in a sample of ambient fluid. The ambient fluid may be atmospheric air, a process gas, or a liquid such as water. Some embodiments employ a plurality of chemical detection sensors and in some embodiments one or more of the chemical detection sensors have two levels of alarm conditions. A situation indicator is provided to provide alarm indications when the concentration level of chemicals exceeds a threshold amount. In some embodiments the chemical detection system includes a collection device for retaining a sample of chemicals entrained in ambient fluid. A visual imaging device may be provided to produce an electronic visual image of a scene associated with a location of the chemical detection system. Visual image data and detected chemical concentration levels may be recorded in an information storage system.