The EQUA Carbon Dioxide Index

How the EQUA CO2 Index helps

With more test results than any other independent organisation, Emissions Analytics has pioneered the use of PEMS to compare real-world vehicle performance.

The EQUA CO2 Index provides an easy to understand rating from A to F, allowing comparison between vehicles regardless of fuel type. It also reveals how close it gets to the official figures on a scale of 1 to 5.

For example an “A1” would be the least polluting car (A) with the most accurate official CO2 results (1) while “F5” is the worst polluter (F) and furthest from the official number (5).

Ratings Explained

Rating Lower bound1 Upper bound2
A 0 200
B 200 300
C 300 400
D 400 500
E 500 600
F 600
Units: g/mi, 1 exclusive, 2 inclusive

Test or Forecast

Emissions Analytics has now tested more than 600 vehicles in the United States, covering a wide range of makes, models and engine types. This enables us to forecast emissions for cars we haven’t yet tested. So, the table contains CO2 numbers for a wide range of cars on sale in the United States in the last five years, clearly labelled whether they are based on an actual Test or Forecast.