The university can watch diesel smoke coming out of a train
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Space technology at the University of Leicester is being used to monitor air pollution in the city.
Telescopes take pictures of the sky at different angles to build up a picture of pollution at a given time.
Dr Paul Monks from the Department of Chemistry said the technology was amazingly accurate.
He said: "In fact, it is so sensitive, we can pick up trains leaving Leicester rail station."
He explained: "By a bit of simple geometry - the sort of stuff you learned at school - we can work out and triangulate where the pollution is coming from.
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