Most studies show the amount of caffeine in two American cups of coffee (about 8 ounces each) can raise your systolic blood pressure 3 to 14 mm Hg and diastolic blood pressure 4 to 13 mm Hg, at least in the short term. One study does show much lower numbers, but an increase is associated nonetheless.
Low levels of formaldehyde in indoor air are actually very common. When found at high levels in air, it can be detected by a sharp smell. High concentrations of formaldehyde can cause irritation of the eyes, nose and throat and can worsen asthma symptoms in children and infants.ll houses had at least some formaldehyde in indoor air. On average, formaldehyde levels measured over a day in Canadian homes were 20-40 Î¼g/m 3 (16-32.5 ppb). Daily levels as high as 95 Î¼g/m 3 (77 ppb), however, have been recorded.
Formaldehyde can be toxic, allergenic, and carcinogenic. Because formaldehyde resins are used in many construction materials it is one of the more common indoor air pollutants. At concentrations above 0.1 ppm in air formaldehyde can irritate the eyes and mucous membranes, resulting in watery eyes.t is mainly used in the product of industrial resins, e.g., for particle board and coatings. In view of its widespread use, toxicity, and volatility, formaldehyde is a significant consideration for human health. In 2011, the US National Toxicology Program described formaldehyde as  known to be a human carcinogen .