It’s no secret gas-powered leaf blowers make a lot of noise. “I think we’ve all had the experience of walking past somebody using a gas blower on full throttle,” says Dan Dyson, branch manager of the Burtonsville branch of Level Green Landscaping. “You can’t hear anything except the blower. Put a couple of them together and it’s deafening noise.”But it doesn’t have to be that way. “Last week I was on a job where the edgers, the weed eaters and the blowers were all electric,” Dyson says. “You barely knew we were there. You could actually have a conversation.”Expect more of that quiet in Montgomery County next summer when a ban on gas-powered leaf blowers goes into effect.