Here's why:

* It's ineffective: Kerosene oil does not kill mosquito larvae, the stage of the mosquito lifecycle responsible for spreading malaria.

* It's harmful: Kerosene oil is a toxic substance that can harm aquatic life, pollute the environment, and even be dangerous to humans.

* There are proven methods: Effective methods for malaria prevention include:

* Insecticide-Treated Nets (ITNs): These nets protect people while they sleep, when mosquitos are most active.

* Indoor Residual Spraying (IRS): This involves spraying insecticide on the walls of homes, where mosquitos rest.

* Larvicides: These are chemicals that are applied to stagnant water to kill mosquito larvae.

* Mosquito control: This includes eliminating breeding grounds for mosquitos, such as stagnant water, and using mosquito repellents.

It is important to use safe and effective methods for malaria prevention. Kerosene oil is not a solution.