1. Tuberose - After stopping photosynthesis at night, it will emit a large amount of waste gas. This waste gas smells delicious, but is not good for human health. If left indoors for a long time, it can cause dizziness, coughing, even asthma and insomnia. Therefore, place tuberose indoors during the day and move it outdoors in the evening.
2. Natural oxygen generator - cactus and other succulent plants native to tropical arid areas have stomata on their fleshy stems that are closed during the day and open at night. They absorb carbon dioxide and produce oxygen at the same time, making the indoor air cooler. The concentration of negative ions in the air increases. Plants such as tiger orchid, tiger tail orchid, agave, brown hair palm, galanthus, sedum, ground root, cultivated pineapple and other plants can also purify the air at night.
3. Pine and cypress - the aromatic smell emitted by these flowers and trees has a stimulating effect on the human gastrointestinal tract. If smelled for too long, it will not only affect people's appetite, but also make pregnant women feel upset. Feeling nauseous and dizzy.
4. Air scavengers - aloe vera, spider plant, Sansevieria orchid, orchid, and monstera are natural scavengers that can remove harmful substances in the air. Studies have shown that Sansevieria and Chlorophytum can absorb more than 80% of indoor harmful gases and have a strong ability to absorb formaldehyde.