ABSTRACT
This study was conducted in a copper and aluminium company in Alexandria. Levels of exposure were ranked according to compliance with threshold limit value [TLV] of the ACGIH into high, i.e. above TLV, moderate i.e. within TLV, and low heat stress. Heat stress measurements exceeded the TLV in 50% of the measured areas. Heat strain indices in terms of recovery oral temperature, and recovery pulse rate as well as systolic blood pressure were significantly higher among the high versus the low exposure groups, but within average physiologic limits. Increased T wave amplitude was observed in ECGs of high exposure group. Hematological examination revealed non-specific findings in terms of mild degree of anemia, decreased clotting time, and increased bleeding time among the high exposure group