What is the fine-grained topic of the following text: "Men and women who answered the call of duty after the gravest terrorist attack in our nation's history stood there on the pile looking for survivors, finding remains, doing the horrible work of cleaning up after such a loss — all the while breathing in so many deadly toxins that are now killing them," said Sen. Kirsten Gillibrand (D-NY). Only return the topic.
Health risks faced by 9/11 first responders