The Ferret and The Herald's joint investigation revealed the data from the Scottish Environment Protection Agency (Sepa) with major global oil companies among those to be ranked “very poor” by the environmental regulator.

The list includes companies up and down Scotland, from crematoriums to waste sites, to oil plants and golf courses.

So, who are the companies? And what have they done? Here are 13 notable sites ranked as either “poor” or “very poor” by Scotland's environmental watchdog.

READ MORE: Under2 Coalition: Scotland leads huge international climate change pact

ExxonMobil, Mossmorran – very poor

The world’s largest publicly traded international oil and gas company was rated “very poor” by Scotland’s environmental regulator.

Its ethylene plant in Mossmorran, Fife was flagged by Sepa over a series of gas flaring incidents in April 2019.

The plant has been accused of having a poor environmental record in the last few years, being rated “poor” in both 2017 and 2018.

ExxonMobil said its £140 million upgrades to the site will mean flaring will be reduced by “98%” next year.

Ineos Kinneil, Terminal, Grangemouth – very poor

British chemical company Ineos was also scolded for its environmental record, with its North Sea oil and gas terminal at Kinneil, near Grangemouth on the Firth and Forth being rated as “very poor” for 2019 due to flaring.

This is the sixth year running the plant has been rated either “poor” or “very poor”. Sepa said it had been “consistently non-compliant since 2014”.

Trump Turnberry, Ayrshire – very poor

Donald Trump’s luxury golf resort at Turnberry in Ayrshire was assessed as “very poor” by Sepa after it breached limits on water usage.

Sepa previously said efforts are being made to combat the issue, including storage tanks.

Inverness Airport – very poor

Among a number of airports to make the list is Inverness Airport, which was ranked “very poor”.

The rating was given after the discharging of chemicals during the de-icing of aircraft in the winter led to pollution.

Inverness Airport has been rated as “very poor” every year since 2014.

READ MORE: Cambo oil field: Oil and Gas Authority refuse to release documents

Edinburgh Airport – poor

Edinburgh Airport was also ranked as “poor” for pollution caused by de-icing aircraft.

It follows on from 2018 where the major transport destination was also rated as “poor”.

Edinburgh Airport refused to comment on the findings, telling The Ferret: “It is concerning we are being asked to comment on something we understand to be obtained in an illegal data hack."

Aberdeen Airport - poor

Aberdeen Airport is added to the list for the same reason as the previous two, with the airport being ranked as “poor”.

The airport said it had put in place measures to fix the issue. Aberdeen was also ranked “poor” in 2018.

Wick Airport - poor

Wick is the last of the airports to make the list due to pollution caused by de-icing airplanes.

The airport has had a “poor” rating in three previous years.

Hial, which runs both Wick and Inverness, said 90% of the work undertaken to tackle the issue was either “completed or nearing completion”.

Faslane Nuclear Base, Helensburgh - poor

The UK’s Trident nuclear base at Faslane, near Helensburgh was rated as “poor” in 2019.

The assessment by the environmental regulator came after it had polluted the Clyde with toxic chemicals.

The Royal Navy said it was an “isolated event”, adding that pollution in 2020 was low.

CalaChem, Grangemouth – poor

Bad smells from CalaChem’s effluent treatment plant led to the company being rated as “poor” by Sepa.

It follows on from 2018 when the plant was given the same rating for the same reason.

The company has said it is investing £1.1m in a new odour abatement unit to reduce the smells, expected to be commissioned in 2022.

2 Sisters Chicken Plant, Coupar Angus - poor

Also appearing on the list for bad smells is the 2 Sisters chicken processing plant in Coupar Angus, Perth and Kinross which was assessed as “poor”.

The company said there had been a “large reduction” in odour issues in the last two years, adding it had engaged with environmental consultants and invested in infrastructure to prevent more bad smells.

Linn Crematorium, Glasgow - poor

Air pollution caused by the Linn Crematorium near Netherlee led to it being assessed as “poor” in 2019.

The Glasgow City Council-run crematorium has been ranked either “very poor” or “poor” every year since 2014 due to emissions of particles and gases.

A council spokesperson told The Ferret that it has undertaken the “necessary” repairs to act in accordance with environmental standards.

READ MORE: Scottish CND slam fusion reactor as attempt to 'keep industry alive'

Daldowie Biomass Plant, Glasgow - poor

This Drax-owned sewage sludge plant in Glasgow, Daldowie was ranked as “poor” in 2019 because of odour issues.

Due to public complaints of smells, it was also ranked “poor” in 2018.

Drax says it had installed technology to reduce the smells in 2018.

It suggested the plant was in fact good for the environment, saying: “The plant plays an important role in converting sludge into sustainable fuel pellets which have replaced coal in manufacturing cement, helping the sector decarbonise and reduce emissions.”

Tarmac Cement Works, Dunbar - poor

Sepa rated this cement works in Dunbar, East Lothian as ”poor” due to “dust emissions”.

The dust reportedly covered the local area and led to complaints by local residents.

The Tarmac-operated plant was rated as “poor” in 2014, 2017 and 2018.

The company said it is committed to minimising the risks associated with its operations.