The environmental fallout from the staggering chemical blast in Danvers yesterday was still being measured overnight as officials took samples from surrounding land and the nearby Waters River to government labs for testing.

Last night, Danvers Fire Chief James P. Tutko said early air quality samples showed little to no evidence of toxins. But with the site of the explosion known to hold a wide range of hazardous chemicals and solvents, testing will continue until a complete picture emerges.