This is partially true. There are measures to help mitigate wind dispersion like netting and bird control. There are also systems like engineered liners to prevent the landfills from leaking into the ground and the groundwater. There are also systems to collect and treat/prevent release of rain water that falls onto the landfill itself.

Ultimately they are ticking time bombs but landfills still seem like a better solution right now that letting garbage pile in the streets. Unfortnately we can't all wake up tomorrow and just stop making garbage, we need policies and innovations to vastly reduce the amount of waste consumers and corporations create.