Nox (unit)

Okay kiddo, have you ever seen a car or a truck that spits out smoke from the back? That smoke is actually made up of tiny particles called "nox" which is short for nitrogen oxides.

Now, nox is a unit used to measure how much of these tiny particles are coming out of a car or a truck's tailpipe. People care about nox because too much of it can make the air dirty and even make it harder for us humans to breathe!

So, scientists have a special tool called a nox meter that they use to measure how much nox is coming out of a car or a truck. They can take that number and compare it to a limit that the government sets to make sure the air stays clean enough for us all to breathe.

So, basically, nox is a measurement that tells us how dirty a car or truck's exhaust is, and we want that number to be as low as possible for a healthier planet!