Have you ever wondered if your carpets are making you sick?
You may think that since the rubber is under the carpet, it is well away from you, and therefore should not be a problem. This may be true when the underlay is new, but over time, as it breaks down, it will release latex dust which can find its way into the air.
The solution to the carpet underlay problem is to use an underlay made of needle punched fabric rather than rubber.
For another reason carpets can make you sick, see new carpet illness