If you mean ‘dirty’ as in brown and carrying dirt, then the Thames does carry a load of silt, and the effect of tides in its lower reaches (through London and towards the sea) means that the silt on the river bed is constantly being stirred up and suspended in the water.

However, as Andrew tells Sun Online Once, even once the sewer is completed, the Thames will still look brown. This is because it is a muddy river, owing to the silt on the riverbed – but any new water that enters the system will be clean “almost overnight”.

He says, “Swimming in the Thames is dangerous on so many levels. It’s not just the sewage people should be aware of, but the tides, currents and water traffic too. The RNLI’s two busiest lifeboat stations aren’t on the coast – they’re on the Thames, rescuing people from the water in central London.

Most of this has been due to legislation: a whole bunch of laws were passed to stop agriculture dumping their waste in the river, alongside as a set of projects along the river to create habitats for wildlife. Today, the Thames contains 125 species of fish, and more than 400 species of invertebrates.

The 10 places with the best air quality

• Malone, New York.
• Seneca Falls, New York.
• Monroe, Michigan.
• Ottawa-Peru, Illinois.
• Washington, North Carolina.
• Mount Pleasant, Texas.
• Salem, Ohio.
• Jasper, Indiana. Population: 54,923 Median AQI: 4 Top pollutant: Sulfur dioxide.

(WWBT) – Virginia was ranked the ‘Grossest State in America’, in a study released by career site Zippia. The ranking was based on things like dirty air, trash and the spread of illnesses such as the flu. Some cultural factors were also included in the study based on Google Searches for Mayo recipes and Crocs.

The world’s cleanest cities

• #1: CALGARY. Calgary in Canada is the world’s cleanest city, and with a population of more than a million, that’s quite something.
• #2: ZURICH. Zurich in Switzerland attracts thousands of tourists every year, especially those who enjoy the winter snow.
• #3: LUXEMBOURG.
• #4: ADELAIDE.
• #5: SINGAPORE.

Hawaii is America’s healthiest state, with fewer preventable hospitalizations than anyplace else, according to the Centers for Disease Control and Prevention. The air is the cleanest of any state. Hawaii offers an abundance of attractions.

Maine

• Nations With the Worst Water. More than a quarter of the world’s population – about 2.1 billion people – lack access to clean water, according to a report released this week by the World Health Organization and UNICEF.
• Mexico.
• Congo.
• Pakistan.
• Bhutan.
• Ghana.
• Nepal.
• Cambodia.

1. Eritrea: 80.7% lack basic water services.
2. Papua New Guinea: 63.4% lack basic water services.
3. Uganda: 61.1% lack basic water services.
4. Ethiopia: 60.9% lack basic water services.
5. Somalia: 60% lack basic water services.
6. Angola: 59% lack basic water services.
7. Democratic Republic of the Congo: 58.2% lack basic water services.

List of Worst Bottled Water

• Store Brand Bottle Water 3/10.
• Propel – Score: 3/10.
• Iceberg – score: 5/10.
• Dasani – Score: 5/10.
• Aquafina – Score: 5.4/10.
• Naleczowianka – Score: 5.9/10.

Read on to find the 10 cities that have the cleanest tap water.

1. 1 Louisville Knows It Is All About The Filters.
2. 2 Oklahoma City ‘s Water Comes From Man-Made Lakes.
3. 3 Silverdale, Washington Knows How To Do Water.
4. 4 Greenville Is A Great Place In South Carolina.
5. 5 Fort Collins Has The Mountain Water.

• Switzerland. If you’ve ever been to Switzerland, it probably won’t surprise you that the alpine nation is home to some of the world’s cleanest tap water.
• Canada.
• United Kingdom.
• New Zealand.
• Singapore.
• Germany.
• Scandinavia and Finland.
• Castle Water Partnership with Save the children.