It's feared a stream near Gatwick Airport could takes years to recover fully, after pollution killed up to 1000 fish.
High levels of ammonia were detected in a tributary of the River Mole at Horley.
Mature specimens of Barbel, Chub and Pike were among the fish found dead.
Investigations are underway to find the source of the pollution, as Malcolm Shaw reports.
It has been described as one of the most polluted cities in the country - and now Southampton is being shamed into taking more action - by a billboard.
Pollution is responsible for 110 deaths in the city each year. And it's estimated to cost the local NHS an annual 50 million pounds.
Emissions from traffic and Southampton Port. has prompted the Clean Air Initiative to create a new sign to get their message across. Sam Holder reports.
A controversial billboard which criticises the high levels of pollution in Southampton has been put up on one of the city's roadsides.
Pollution levels have been said to be responsible for one hundred and ten deaths in Southampton every year. The poster was paid for by the Healthy Air Campaign - members want to raise awareness of the threat posed by air pollution. According to NHS figures, pollution costs the city's health service fifty million pounds each year. Andrea Lee from the Healthy Air Campaign told ITV more about their aims.
There are calls for all local authorities to be given the power to charge drivers for entering towns and cities, to improve air quality. In December the Environment Department published details on bringing in clean air zones in cities like Southampton by 2020. It's aimed at discouraging the most polluting vehicles.
Now it might be just annoying - or it could be driving you mad. Noise is a widespread problem and, in an increasingly hectic world, it's probably only going to get worse.
So how could it affect you? ITV's Tonight programme has commissioned a new noise map identifying the worst problem areas.
Consumer Editor Chris Choi reports.
Crawley has been badly hit by today's pollution and smog, with visibility down to a few yards.
These were the scenes at Dartford this morning on the day that pollution and smog across the south east is predicted to hit dangerous levels. Experts have warned that anyone suffering the effects, including sore eyes, coughs and sore throats, should cut down the amount of activity they take outside.
Thames Water has been fined more than £27,000 for causing the pollution of a river in Surrey
The incident saw a pipe burst in a field behind Walton Lane sewage pumping station in Weybridge and flooded the field with sewage, which then entered the Engine River.
The company admitted the offence at Staines Magistrates Court on Friday May, 24.
The company was fined £18,000, ordered to pay costs of £9,764.15 and a victim surcharge of £15.
Thames Water was advised by the Environment Agency to contain the spilt sewage with sandbags and removal of sludge from the top of the river.
However, the court heard how Thames Water did not make enough effort to contain the pollution and affecting over 1.2 kilometres of the river.
More than 2,400 birds were killed in two chemical leaks off the south coast in February and April. The RSPCA say it's one of the worst marine pollution incidents in decades and was caused by boats discharging a substance called polyisobutene, also known as PIB, in the sea.
To date 18 species of birds have been affected, the majority being guillemots and most washed up in Dorset. The death toll exceeds that of the Napoli incident off the coast of Devon in 2007.
Adam Grogan from the RSPCA said: “The dumping at sea of this lethal chemical must be stopped.