Which emission measure's data is known for the highest percentage of cars?

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Multiple Choice

Which emission measure's data is known for the highest percentage of cars?

Explanation:
CO2 data are the most widely available across cars because carbon dioxide is the main greenhouse gas tied to fuel use and is routinely measured or estimated in nearly all vehicle emissions tests and databases. This makes CO2 data coverage reach the highest percentage of cars. In contrast, measurements for CO, NOx, or hydrocarbons depend more on specific engine types, aftertreatment, testing methods, and conditions, so their data aren’t as universally available.

CO2 data are the most widely available across cars because carbon dioxide is the main greenhouse gas tied to fuel use and is routinely measured or estimated in nearly all vehicle emissions tests and databases. This makes CO2 data coverage reach the highest percentage of cars. In contrast, measurements for CO, NOx, or hydrocarbons depend more on specific engine types, aftertreatment, testing methods, and conditions, so their data aren’t as universally available.

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