I noticed that within the past month or so I have a lot of air when I
turn on the hot water. As the water gets warmer the air gets worse.

Since it's only the hot water I assume it's a problem in my house, but
just to be sure I checked with my neighbors and the do not have any
problems. We have town water.

What could be causing this? The air comes out in strong bursts
sometimes and it makes the pipes vibrate.

thanks.