71.   Officials of the Maryland Department of the Environment said regular air quality tests since Wednesday showed no signs of hazardous chemicals in the smoke.

72.   Officials of the Maryland Department of the Environment said regular air quality tests since Wednesday detected no hazardous chemicals in the smoke.

73.   Officials of the Maryland Department of the Environment said air quality tests since Wednesday detected no hazardous chemicals in the smoke.

74.   One of the cars remaining underground still carried hazardous chemicals.

75.   Scores of firefighters donned oxygen masks to enter the tunnel, where the CSX freight train with eight cars loaded with hazardous chemicals left the tracks.

76.   Several homes were evacuated Saturday night after a derailed train car began leaking a hazardous chemical.

77.   She pointed out that not only did many Indonesian children have to work, they were often exposed to numerous dangers including hazardous chemicals.

78.   Security in the city was increased Tuesday shortly before Attorney General John Ashcroft told Congress that terrorists may be planning an attack using a truck carrying hazardous chemicals.

79.   Six of the cars remaining underground still carried hazardous chemicals.

80.   Tamplin said most countries in the region do not have specific programs to control hazardous chemicals and wastes.