When you are called to extinguish a trash can which is on fire you currently get 5 fire fighter XP and $500. I feel like this is far too low as you only get two missions a day.
I suggest the rewards should be increased to closer match the duration and reward of criminal investigations and extinguishing buildings (around 60 XP and $8000). This could be done by having the player put out several fires in a proximate area and contact a witness who saw the perpetrator.
Hope that the suggestion is found to be relevant and applicable!
//Barry