Why are my sims complaining about too many injuries?

I only have 1500 population now. I'm trying to reach high density first and give them everything they need, but they are telling me that "There are too many injuries". I have a clinic which is never full with 3 ambulance cars on the opposite side of the road so I don't get it. How can this be solved?

Solution 1:

Education is the key here actually. It will lower the chances of your sim's getting sick or injured as well as decrease the amount of power/water that they will consume. It does not matter the level of education but you should be aware that anything above a high school will affect your industrial production.