Aside from prevention measures that nobody wants to pay for to keep them from happening in the first place? Not a whole lot.

The sampling equipment/testing supplies have a shelf life and are super expensive... To the point where it's prohibitive to keep them in stock in local communities.

Perhaps having a kit associated with different cargo to keep with the engineer that can detect cargo and their byproducts, or to add reaction byproducts (including combustion) to SDSs in the manifest would give better Intel on evacuation requirements.

Overall, in my opinion, the system needs to not only punish/fine when preventable incidents happen, but reward prevention actions when they do occur. Otherwise fines become the cost of doing business and are part of the decision matrix when deciding where to spend money on prevention.