fire works

Since it is near the 4th of July, They did there annual fire works. Last year once my dog saw the fire works he would be fine and stop whimpering exc; But this time he didn't we went in this parking lot where other people are watching also. I am not sure if it was the people or not. We just got back and he is fine. Last year he enjoyed the fire works he enjoyed them alot, but this year was different,we began in the car and he began to bark so we got out of the car and he stopped, but then whimpered????? Do you think he is nervice about all the people? Maybe he didn't mind the fireworks????? what do ya'll think??????