The French manufacturer has been given an average CO2 emissions target across its range of 121g/km and figures show it is less than one per cent away from meeting the criteria.
It is in stark contrast to many other manufacturers, who face hefty fines for not meeting European targets on CO2 emissions next year.
Manufacturers will be fined up to 1,500 Euros for each car sold if they do not meet the criteria, a huge cost Citroen will now avoid.
The French car maker has achieved the low CO2 figure by investing in its low-CO2 ‘Airdream+’ technology.
It now sells four cars that fall under 100g/km of CO2 emissions and subsequently qualifies for exemption from Vehicle Excise Duty (VED) and the London congestion charge in the UK.
These include the new Citroen C-Zero electric car, which went on sale in January from Citroen dealerships.
Other models include the Citroen C3 supermini, the more upmarket Citroen DS3 and the all-new Citroen C4 hatchback.
Citroen also plans to introduce a diesel-hybrid model in the shape of the new Citroen DS5 executive car, which will bring down average CO2 emissions in the range even further.
While Citroen closes in on its individual target, which is based on the average weight of cars it sells, other manufacturers are also close to meeting European CO2 emissions standards.
Peugeot is just 3.5g/km off its 126.57g/km target and should ease closer when the diesel-hybrid Peugeot 3008 HYbrid4 and Peugeot 508 RXH models go on sale by 2012.
Kia is less than 5g/km off its target and also plans to introduce a hybrid model based on the Kia Optima saloon.
Meanwhile, Vauxhall and Ford are 10g/km away from their individual targets, but both manufacturers have a range of hybrid and electric cars set for launch over the next 24 months.
These included the extended range electric Vauxhall Ampera and the Ford Focus Electric version of the best-selling hatchback.