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Wang Qinghua, a home safety inspector in Jinan, East China’s Shandong Province, recently found excessive levels of formaldehyde gas, a carcinogen, in 97 out of the 100 households he surveyed, with 72 homes having at least three times of the national standard of gas density.
Indoor formaldehyde contamination is closely linked to home renovation, with the gas mostly emitted by composite wood furniture products including particleboard, medium density fiberboard (MDF) or plywood. Some of the houses Wang found with excessive levels of formaldehyde were last renovated five years ago.
Studies show that these wood products can emit formaldehyde for three to 15 years. Song says the only way to fight this issue is to eliminate all formaldehyde from furniture.