As mentioned before, that insect repellent aroma called "Expanse Mirroring Mirror Incense, ninth generation," developed at Master Guna's alma mater, has long been built into every Magic Crystal Lamp in Academy City. It's an engineered construct that doesn't harm any intelligent race but can effectively drive away all kinds of mosquitoes and poisonous bugs. Its working principle has been listed as one of Academy City's top secrets; outsiders only know the effect is ridiculously good, but they can hardly imitate it.
After the last Academy City exchange conference ended, many factions sent large orders for "The Insect Repellent" to Academy City, including but not limited to nations, various associations, large Mercenary Corps, and many well-known chambers of commerce and financial groups. In short, it's very popular.
