Q: Until recently, my blood pressure stayed around 135/75. About two weeks ago, my blood pressure suddenly shot up to 188/90. My doctor increased the doses of my blood pressure pills. But my systolic pressure is still around 170. Why would my blood pressure have increased so suddenly when I hadn't really changed anything? Is 170 systolic OK given my diastolic pressure is 80? A: One of the mysteries of blood pressure is that it can rise or fall without any obvious changes in your life.
The level of CO concentration is measured using a system called Parts Per Million (PPM). For example, 100 PPM CO means that for every 999,900 molecules of air, there are 100 molecules of CO. CO effects people differently depending on the concentration.
Carbon dioxide CO2 levels outdoors near ground level are typically 300 ppm to 400 ppm or 0.03% to 0.040% in concentration. Carbon dioxide CO2 levels indoors in occupied buildings are typically around 600 ppm to 800 ppm or 0.06% to 0.08% in concentration.You'll find this data in many indoor air quality articles and books and it's consistent with what we find typically in our own field measurements.oxic levels of carbon dioxide: According to occupational exposure and controlled atmosphere research into CO2 toxicology, CO2 is hazardous via direct toxicity at levels above 5%, concentrations not encountered in nature [except perhaps at or near an active volcano or at water-logged soils].