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  2. Nuclear winter - Wikipedia

    en.wikipedia.org/wiki/Nuclear_winter

    Light level reduction of 0% in low latitudes to 90% in high smoke injection areas; SCOPE figures for winter smoke injection: Temperature drops between 3 and 4 °C; Following one to three years: 25–40% of injected smoke is stabilised in atmosphere (NCAR). Smoke stabilised for approximately one year. Land temperatures of several degrees below ...

  3. Air quality guideline - Wikipedia

    en.wikipedia.org/wiki/Air_quality_guideline

    In terms of health effects, the guideline states that PM 2.5 concentration of 10 is the lowest level at which total, cardiopulmonary and lung cancer mortality have been shown to increase with more than 95% confidence in response to long-term exposure to PM 2.5. [2]

  4. Indoor air quality - Wikipedia

    en.wikipedia.org/wiki/Indoor_air_quality

    To eliminate most complaints caused by CO 2, the total indoor CO 2 level should be reduced to a difference of no greater than 700 ppm above outdoor levels. [90] The National Institute for Occupational Safety and Health (NIOSH) considers that indoor air concentrations of carbon dioxide that exceed 1000 ppm are a marker suggesting inadequate ...

  5. 10 great nutritional supplements for winter - AOL

    www.aol.com/10-great-nutritional-supplements...

    Research suggests that 25-hydroxy vitamin D levels between 50-80 ng/mL is considered optimal for maintaining excellent health. While sun exposure helps us manufacture vitamin D ...

  6. The best sunrise alarm clocks of 2025 - AOL

    www.aol.com/lifestyle/best-sunrise-alarm-clocks...

    Notable features: Brightness variable from 0%-100% | Sunset simulation | 13 preloaded alarm sounds | Numerous relaxation sounds | Night-light setting The Hatch Restore 2 is a full-featured sunrise ...

  7. Some winter viruses could trigger heart complications ... - AOL

    www.aol.com/news/winter-viruses-could-trigger...

    Johanna Contreras, M.D., a cardiologist at Mount Sinai Fuster Heart Hospital in New York City, said she has seen people mistaking virus symptoms for serious heart complications.. Some patients who ...

  8. Death zone - Wikipedia

    en.wikipedia.org/wiki/Death_zone

    [1] [4] [5] Scientists at the High Altitude Pathology Institute in Bolivia dispute the existence of a death zone, based on observation of extreme tolerance to hypoxia in patients with chronic mountain sickness and normal fetuses in-utero, both of which present pO 2 levels similar to those at the summit of Mount Everest. [16]

  9. The 20 best Walmart deals this week: Kitchen appliances, a ...

    www.aol.com/lifestyle/the-20-best-walmart-deals...

    In fact, Dr. Ashley Magovern, Board-Certified Dermatologist and Medical Advisor for Dermstore, recommended the 30 SPF version of this moisturizer to us in our guide to the best sunscreens of the year.