You might get one of those low-end decibel meters that supposedly are calibrated at the factory (around $25 in the US), to measure how loud the sirens are. Maybe they're louder than they need to be, and you can request for them to be adjusted, as a public health improvement.
I've been meaning to do something like this. My city has sirens throughout the day, but one particular ambulance company's seems much louder to me than any other company or other emergency vehicle -- dangerously louder. As someone who walks miles every day, on major streets and near hospitals, the near-daily potential hearing damage risk has started to get a bit concerning. I'd like to have data (and make sure it's not just a frequency sensitivity specific to me), before I ask them respectfully if the volume can be adjusted.