The alarms sound as agent leaves the stack. There is no way to protect the community. There is not enough time. Panic will become a factor. The community has minutes to respond.
Exposure means long-term health effects.
The best way to protect the community is to have a technology that has no smoke-stack. As incineration uses high temperature an pressure, neutralization uses low temperature and pressure. Neutralization allows for the test-release concept. It allows for analysis of effluents each step of the way, before releasing them to the environment. It is controllable and incineration is not.