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Rubber does tend to have a pungent odor. However, mats made from recycled tires are non-toxic (references: http://www.rubbermulch.com/playground_surface.htm, http://www.detailedplaypro.com/playground-surfacing.htm, http://www.asandc.com/playsafe/).
It is possible, if you feel effects from the rubber, that you are allergic to it.
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