Of burning mosquito-repellent incense smoke contains 4 categories of harmful substances, ultra-fine particles (particulate matter less than 2.5 microns in diameter), polycyclic aromatic hydrocarbons (PAHs) and carbonyl compounds (such as formaldehyde and acetaldehyde) and benzene. In addition to these 4 obvious harmful substances, mosquito-repellent incense has a lot of organic fillers, adhesives, dyes and other additives, although these substances make mosquito flameless smoldered, but for human health, as well as a potential threat. Mosquito repellent poisonous, but journalists in the survey found that many consumers in the purchase of mosquito-repellent incense only cares about mosquito repellent effect, brand and flavor, only few of the careful customer will pay attention to whether the product is a "toxic", "low toxicity" products. Xinhua learned from the quality inspection departments, mosquito-repellent incense products commonly found in "d-tetramethrin," "propargylic permethrin", "four f-methyl methyl ether grade" ingredients such as real as pesticide ingredients. According to the current regulations of the State, to prevent, destroy or control mosquitoes, flies and other pests, pesticide use, shall comply with the provisions of the national regulations on pesticide management.