A system for detecting pollution by a poisonous material for an air exhauster of a vehicle may include a temperature sensor provided to the flow line of an exhaust gas and having a catalyst material that causes an exothermic reaction with a pollution material in the exhaust gas, and a controller which stores a standard temperature value of the temperature sensor and operates in such a manner that the exhaust gas may be heated under control of an engine control unit when the temperature value drops by a predetermined amount from the standard temperature value, and that the catalyst material may be determined to have deteriorated when a measured temperature value after heating may be less than the standard temperature value, so that the standard temperature value may be replaced with the measured temperature value, and to a detection method using the same.