According to the British Heart Foundation in the next decade, 1,600 people in Cumbria could die due to problems caused by air pollution.
Staff and volunteers from Eden Rivers Trust have produced and starred in a video raising awareness of septic tank pollution.
An investigation into a slurry leak, which killed thousands of fish in the Penruddock area on the fringes of the Lake District, is continuing.
Members of the public reported brown water, and dead fish floating on the surface, at at Skitwath and Dacre Becks.
Environment Agency officers were sent to contain the leak, which was found to have been slurry.
Thousands of fish, including trout and salmon, died, and officers remain in the area investigating.
Members of the public raised the alarm after seeing dead fish floating on the brown water at Skitwath and Dacre Becks, near Penruddock.
Health warnings have been issued in parts of the UK as air pollution is forecast to hit "high" or "very high" levels today.
Children at a Cumbrian school are learning about the causes of water pollution using an environment agency video.
Crystal the Crab will explain to youngsters at Allonby Primary School how things - like dog fouling and washing machines or toilets that are not properly plumbed - can pollute sea water.