A space satellite built in Hertfordshire has started beaming images of pollution back to Earth.
The Sentinel 5 Precursor was constructed at Airbus Defence and Space in Stevenage.
The pictures will show us the extent of pollution - both man-made and natural - in our air around the world and hopefully lead to solutions.
The Sentinel 5 was designed to last for seven years but it's gone into orbit so successfully the signs are it could now last twice as long.
- Click to watch a report by ITV News Anglia's Matthew Hudson