TABLE 1.

NUMBER OF ANIMALS EXPOSED TO O₃ (0.8 ppm, 8 h/d, DAILY FOR 90 d) AND 1-NN (INTRAPERITONALLY)

	FA	O3	FA	O3	FA	O3
Time after 1-NN Treatment	2 h		6 h		24 h
0 mg of 1-NN/kg			4	4	4	4
12.5 mg of 1-NN/kg			4	3	4	4
50 mg of 1-NN/kg	5*	5*	4	4	4	4

Definition of abbreviations: 1-NN, 1-nitronaphthalene; FA, filtered air.

^*14C-labelled 1-NN.