# What is the real CO2 emission for cars? 1g/km or >100g/km?

If one searches for the different levels of CO2 emissions in cars, one can find two very different levels. For instance:

1: Here it is written that:

The law requires that the new cars registered in the EU do not emit more than an average of 130 grams of CO2 per kilometer (g CO2/km) by 2015.

So it can be seen that the mass of CO2 is described as being over 100 grams/km.

2: Here, one can see that the level of CO is around 1 g/km. So way less than 100 g/km, which is a huge difference.

Now, in the second reference, the table shows that those are the values for CO and not CO2, as in the first case. But in the second one, I can't find the CO2 levels and I assumed that the CO is a typo, and it's missing the "2". However, something tells me that it is not a typo and that they read the levels of CO and not CO2. Now, I have two questions.

Is there a typo in the second reference?

If Yes, Q1: Why is the difference so huge?

If No, Q2: Why do they give the values in CO and not in CO$_2$?