We live on a main road near town! Got 2 cats and a dog that howls at the door
I like fireworks but sometimes pets come first.
Have you tried feliway diffuser. Also theres a new capsule tablet call Zylkene, supposed to calm them down during firework season.
At Diwali there are fireworks going off ten to the dozen by us!! never bothered us until we had the dog, he starts barking and then the cats go bonkers too!!!
I feel like letting a bomb off saying BE QUIETTTTT!! hehe...
Hopes your cats feel safe soon.