Mosquitoes are a real source of nuisance. To get rid of it, most of the mosquito repellents available on the market are loaded with chemicals and their impact on human health is undesirable. To keep mosquitoes away, natural also has a say.

The first mosquito repellant was released to the market in 1956. The use of these products has surprisingly declined, as they are repellents with an unpleasant odor and harmful effects on respiratory health.
The use of chemical insecticides is potentially dangerous due to, among other things, DEET (N, N-diethyl-meta-tolouamide), the active ingredient in many mosquito repellents. The Environmental Protection Agency has found DEETs to be safe for humans, but specifies a list of warnings for their use.
You will be shocked if you learn that up to 56% of DEETs penetrate human skin and 17% are absorbed into the bloodstream.
These commercial mosquito repellents also have very damaging side effects such as:
Difficulty breathing
Chronic cough
Loss of alertness
convulsions
upset stomach
Nausea and vomiting
Insomnia and mood changes
Slight redness of the skin and irritation on the sprayed area.
Blisters, burns and permanent scars
Burning and redness of the eyes, nose and throat.

Forget citronella and DEET. Just take your morning coffee and use it to scare away mosquitoes. How does it work ? Mosquitoes, like many other insects, have a large amount of distinct olfactory receptors. This makes them sensitive to certain strong odors, such as the smell of smoke.
To be honest with you, one of the best ways to keep mosquitoes away is to burn the coffee grounds so that they emit a very strong odor and produce a lot of smoke. You can do this by placing the coffee grounds in a piece of aluminum foil or an aluminum baking tray and burning it like you would with incense.