[james4k]

We already know pollution from cars increases childhood asthma, and I imagine those pollutants could affect brain development as well.

Edit: Also I would be curious to know how dog barks affect children's brains. Of all the environmental noise, dogs are often the loudest and most jarring, anecdotally.

[GoblinSlayer]

IME the loudest are bikes and metro (inside). There's an occasional mustang, but bikes are still louder.

[obruchez]

Motorcycles are absolutely the worst. Even when they drive as slow as possible, to make less noise, they're still noisier than some cars. This is insane. And what's frustrating is that this is considered a feature, not a bug. I don't know how we can get out of that particular culture. I'm not sure electric motorcycles would help at all.

[erikaww]

Dogs barking cannot be worse than cars, especially compensators with the pop pop pop engines or tires screeching. Live right by a doggy daycare and several busy arterials

[dagw]

right by a doggy daycare

Doggy daycares are generally run by people who love dogs and know how to work with them and make them behave. The problem dogs are the ones owned by people who don't care how they behave and just leave them outside and ignore them.

[james4k]

On average I agree. Dog noise doesn't carry nearly as far. But if you're neighbors with noisy dogs, it's probably at the top of your mind.