Question: When was it discovered that asbestos was dangerous?
Answer: 1899
Disambiguated annotations:
qaPairs: question: When was it thought to have been first reported that asbestos may be dangerous?
answer: 1898
question: When was it though to have been first reported that asbestos had negative health effects?
answer: 1899
question: When was the death with a cause related to asbestos?
answer: 1906