Don't leave your engine running
I AM not much of a mathematician so if I am wrong, please correct me.
When a car is idling, it is generally running at around 500 rpm.
It takes two revolutions to complete a cycle, therefore, for every minute the engine completes 250 cycles.
If the engine has a capacity of one litre it will expel 250 litres of poisonous gas every minute.
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That is being conservative as most engines will be idling at possibly 600 rpm or more.
If that engine is left ticking over for five minutes it will expel 1,250 litres of poisonous gas into the air that we all have to breathe. Can you imagine 1,250 one litre bottles stacked up in say, your kitchen or lounge? and that is just five minutes with a one litre engine.
Most engines are bigger than that. Just to make it even worse, the engine has to draw in the same amount of "clean" air before the cycle starts, therefore, the 1,250 litres could possibly be 2,500 in actual effect.
Now imagine leaving your engine running for ten or fifteen minutes because it's too hot or too cold outside and you want the heater or air conditioning on, and your engine is 1.5 or even two litres capacity.
Please think what you are doing to our environment and to the air that we all have to breathe.
That includes our babies, our pets, our friends/relatives with breathing difficulties etc. etc.. For goodness sake, please don't leave your engine running any longer than is absolutely necessary.