The volatilization cycle of formaldehyde is three to fifteen years. It can be said that as long as there is formaldehyde in the new house, it will exist for more than ten years. Generally, in addition to formaldehyde in the air, the sources of formaldehyde such as furniture cannot be completely removed. Mild formaldehyde poisoning is mainly manifested as symptoms of irritation of eye and upper respiratory mucosa, such as conjunctival edema, congestion, laryngeal mucosal edema leading to dyspnea and hoarseness. This smell will not only make pregnant mothers feel very uncomfortable, but also easily stimulate skin and respiratory infections, and often these uncomfortable symptoms will be transmitted to the fetus in the abdomen through the placenta.
Once pregnant women suffer from bronchial asthma, it will not only affect their own health, but also increase the accidents and dangers during delivery. Long-term exposure to bad indoor air will induce and aggravate asthma. The higher the indoor formaldehyde content, the higher the risk of children suffering from asthma. Long-term exposure to low-concentration formaldehyde or high-concentration formaldehyde may be harmful to the hematopoietic function of pregnant women and may develop into leukemia. If formaldehyde is inhaled through the nose when exposed, it will cause permanent damage to the brain and kidneys. If the mother is harmed by benzene series during pregnancy, the toxicity may affect the baby and cause defects, and even lead to abortion, fetal malformation, ectopic pregnancy, toxoplasmosis and anencephaly.
Pregnant women accidentally come into contact with a certain amount of formaldehyde in a short period of time and find respiratory irritation, which should be observed for 2 days. In order to avoid the aggravation of illness caused by activities, they should eat more fresh vegetables and fruits and pay attention to rest.