Must-Know

A vehicle should not send out visible smoke for more than:

12 seconds
10 seconds
8 seconds
4 seconds

In New Zealand, a car's exhaust pipe should not emit visible smoke for more than 10 seconds. This is because smoke emitted from vehicles causes serious pollution to the environment, especially when it contains various harmful gases and particulate matter, which can have severe effects on human health. You can remember this rule with the phrase "10-Second Smoke Limit."