A Danish study hints that air pollution from car exhaust might trigger strokes, although much more study is needed to confirm this, the study team notes.

In the study, short-term exposure to certain pollutants affected admission rates for mild, "ischemic" strokes at hospitals around Copenhagen, Denmark. Ischemic stroke, the most common type of stroke, occurs when a clot disrupts blood flow to the brain.

The Danish findings, reported in the European Heart Journal, follow another recent study that showed a link between long-term exposure to traffic-related pollution and stroke death rates in the United Kingdom.

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