An anonymous reader writes: Everyone knows that trees give us all oxygen so we can breathe, but according to an Australian scientists they also affect the concentration of positive and negative ions in the air. A team from the Queensland University of Technology's International Laboratory for Air Quality and Health (ILAQH) ran experiments in six locations all over Brisbane and found that positive and negative ion concentrations in the air were two times higher in heavily wooded areas than in open grassy areas, such as parks.
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