There was a study that Lemongrass herb is a very popular plant found commonly in India and used for medicinal, food and mosquito and insect repellent products. The lemongrass oils are also used in cosmetics, soaps, perfumes, dyes and odorizes along with thousands of other products, so with this we use it in our coil. There was also a study that commercial coil burn without flame for up to eight hours of continuous repelling action. In quantitative tests, they provide about 80% protection. Mosquito coils are also inexpensive and easy to use. They are portable and fit into normal household practices of lighting candles or incense. There are several hazards that are known to be caused by mosquito coils. In 1999, sparks from mosquito coils ignited a fire that swept through a three-story dormitory building at a summer camp in South Korea; 23 persons, including 19 children, died in the blaze. Recent studies showed that the smoke generated from burning mosquito coil is of certain health concerns – one burning mosquito coil produces the same amount of particulate mass (diameter up to 2.5 μm) as 75-137 burning cigarettes would; and the emission of formaldehyde from one burning coil can be as high as that released from 51 burning cigarettes.
Liu, Weili; Zhang, Junfeng; Hashim, Jamal H.; Jalaludin, Juliana; Hashim, Zailina; Goldstein, Bernard D. (September 2003). "Mosquito Coil Emissions and Health Implications" stated that mosquito coils indoors generates smoke that can control mosquitoes effectively. This practice is currently used in numerous households in Asia, Africa, and South America. However, the smoke may contain pollutants of health concern. We conducted the present study to characterize the emissions from four common brands of mosquito coils from China and two common brands
According to the CRC Ethnobotany Desk Reference by Tim Johnson, lemon grass insect repellent and a medicinal plant, and says it's used in food and confections, in perfumes...