Mosquito coils

Mosquito coils work by releasing insecticides into the air, creating a cloud of smoke that repels or kills mosquitoes. Here's a breakdown of the process:

1. Composition:

• Mosquito coils are typically made from a dried paste of pyrethrum powder (or synthetic pyrethroids), a combustible material, and other additives.
• Pyrethrum is a natural insecticide derived from chrysanthemum flowers. Modern coils often use synthetic pyrethroids, which are designed to mimic the effects of pyrethrum.
• The combustible material allows the coil to smolder slowly, releasing the insecticide.
• Other additives may include binders, dyes, and substances that control the burning rate.

2. Burning Process:

• When the coil is lit, it undergoes a slow, smoldering burn. This process releases the insecticide into the surrounding air as smoke.
• The heat from the burning coil vaporizes the pyrethroids, allowing them to disperse into the air.

3. Insecticidal Action:

• The pyrethroids in the smoke interfere with the nervous systems of mosquitoes.
• At low concentrations, they act as repellents, causing mosquitoes to avoid the area.
• At higher concentrations, they can paralyze and kill mosquitoes.
• The smoke itself can also act as a repellant, as most insects find smoke to be irritating.

4. Dispersion:

• The smoke, carrying the insecticide, spreads through the air, creating a protective zone around the coil.
• The effectiveness of the coil depends on factors such as the concentration of pyrethroids, the size of the room, and the airflow.

Important Considerations:

• Ventilation: It's crucial to use mosquito coils in well-ventilated areas. Inhaling excessive smoke can be harmful to humans and pets.
• Safety: keep coils away from flammable materials.
• Environmental Impact: While pyrethroids are generally considered safe for humans at low concentrations, concerns exist regarding their potential impact on the environment and other non-target insects.

In essence, mosquito coils work by slowly releasing insecticides into the air through a smoldering burn, creating a protective barrier against mosquitoes.