Noise Pollution General Discussion & Remedies?

So I was outside and it was kind of quiet and suddenly an air conditioner machine turned on and it wasn't a big deal but I became aware of the issue of noise pollution

I was curious what people think about this issue and about what ideas you might have to improve the noise situation and to manage noise pollution in society

Like in the example of the air conditioner, are there mods that could be made to retrofit old machines to make them quieter? Or are there new quieter designs?

One thing I've thought of is to encourage people to voluntarily use loud machines on certain days of the week if possible, rather than at random times every day (for example, mowing the lawn with loud gas mowers). This may not be realistic though as some people's schedules push them to use loud machinery whenever they simply have a moment.

Any thoughts on how to improve the issue of noise pollution and about the topic of noise management?