Leaves may turn yellow because they are not watered for a long time or watered too much, or they have not seen the sun for a long time.
And the main source of indoor formaldehyde:
First, plywood, blockboard, medium density fiberboard, particleboard and other man-made boards for interior decoration. Because formaldehyde has a strong adhesion, it also has the functions of strengthening the hardness of the board, preventing insects and preventing corrosion, so the adhesive used in the production of wood-based panels at present is urea-formaldehyde resin with formaldehyde as the main component;
The second is wood-based panel furniture. The results of a comparative test conducted by a consumer association in a city show that among 60 sets of medium density furniture samples, 29 sets of formaldehyde exceed the standard, and the over-standard rate is as high as 48.23%;
Third, other kinds of decorative materials containing formaldehyde, such as white latex, foamed plastics, paints and coatings. Experts specially reminded that latex adhesives are widely used in wall treatment in wood engineering and decoration, especially the formaldehyde in latex sealed on the wall is difficult to remove;
Four. Textiles for interior decoration, including bedding, wall cloth, wallpaper, chemical fiber carpet, curtains and fabric furniture. In textile production, in order to improve wrinkle resistance, waterproof and flame retardancy, some additives containing formaldehyde are often added.
The main harm of formaldehyde is irritation to skin and mucosa. When indoor formaldehyde reaches a certain concentration, people will feel uncomfortable. The concentration of formaldehyde exceeding 0.08mg/m3 can cause jealousy, itchy eyes, sore throat, hoarseness, sneezing, chest tightness, asthma and dermatitis.
To sum up, if you suspect that the formaldehyde in your home exceeds the standard, it is recommended to find a professional institution or company to do indoor formaldehyde testing.