Why should we avoid running the vehicle’s engine in a closed placed?

1. Correct answer: Because the emitted burnt gases (exhaust)are toxic.
2. To avoid engine over-heating due to poor ventilation.
3. There is no need to avoid it, because it is not important whether or not the engine is running in a closed or open place.
4. Because the engine cannot be operated in a closed place.

WhyExhaust gases are toxic, so you do not run the engine in a closed place.