Limonene, commonly known as a lemon essential oil, is usually used to make citrus flavoring agents. It is one of the chemical ingredients in the middle of many fragrances such as air fresheners and body sprays. Limonene itself is not terrible because the chemical is harmful to the human body. It does not pose a major hazard. In fact, it can be used as a flavoring agent in foods. However, once limonene is sprayed into the air, it changes quickly. Studies have shown that when limonene is generally present in the air, In the presence of ozone, two limonene molecules will form a single molecule compound-methanol. When a large amount of limonene in the room is converted into methanol, the effect will be very different. It can be inferred from this:. ['Using air fresheners may be harmful to us.', 'Limonene is harmful to the human body when used as a flavoring agent in food.', 'If a high methanol concentration is measured in the room, it means that too much fragrance is used.', 'In life, we should try to avoid using items containing limonene.']