Hong Kong: Men who regularly get exposed to air pollution may be at an increased risk of having poorer quality sperm, resulting in a spell of infertility for a 'significant number of couples', researchers warned. Increased exposure to fine particulate matter (PM2.5) -- fine inhalable particles that have diameters of 2.5 micrometres or less -- have been previously found to reduce growth of working memory in kids, stroke, respiratory problems, kidney, bladder and colorectal cancer besides causing lung cancer.

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