as an additional simple method to attempt to repel mosquitoes from both indoor and outdoor areas. Several research conducted since 2003 have validated its efficacy as a natural repellant, and it comes highly recommended by the American Environmental Protection Agency (EPA). Here is a straightforward method to harness its full repelling potential.
The coffee grounds should be spread out on a foil-lined plate and left in a cool, dry spot until they are fully dried.
Put it on a table or balcony and light it until it starts to smoke; the coffee grounds burn slowly and steadily, driving insects away.