Tattoo pigments can be harmful to one's health. "If the ink is really vivid in color, it frequently contains harmful substances," explained tattoo artist Bergstrom. In addition, the preservative formaldehyde, which is designated as a carcinogen by the IARC, was found in 7% of the inks tested in the research. It's important to know that even if you just touch or inhale the powder, it can be toxic. Formaldehyde is used as a disinfectant and antiseptic. It is also used in embalming fluids and as a chemical fumigant. The body gets rid of formaldehyde through urine and feces. There are several products on the market claiming to remove tattoos. Most involve some sort of heat treatment after which the skin is peeled off the body piece by piece. Only then will the tattoo come off with it. The quality of life for people who suffer from asthma is greatly affected by air pollution. Studies have shown that exposure to high levels of air pollutants such as ozone, pollen, and smoke causes attacks to become more frequent and severe. Asthma patients are more likely to experience heart problems and other illnesses because of their increased exposure to harmful chemicals. Tattoos are treated with oxygen treatments after which the pigment particles are removed. The process requires multiple appointments and can cost up to $10,000. Neither method is safe for children's skin.