[DSH]

All cars have that feature. When the engine isn’t running it’s emissions are zero.

Not necessarily. The vehicle's air conditioning system could possibly be leaking refrigerant, such as a hydrofluorocarbon, which is said to have a high GWP (i.e., global warming potential). That is actually a factor in how the EPA evaluates vehicle emissions when setting GHG emission standards. :-)

[xp38]

The word partial covers that. :)

[Flash Bazbeaux]

Or the driver could fart.