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  • these data are from the international price program. to learn more, see "u.s. import and export prices — august 2020." also see more charts on import and export price trends. import air transportation price data measure payments to foreign carriers by u.s. residents for international air transportation services. export air transportation price data measure payments to u.s. carriers by foreign residents for international air transportation. bls.gov

  • protective environment (pe) is a specialized patient-care area, usually in a hospital, with a positive air flow relative to the corridor (i.e., air flows from the room to the outside adjacent space). the combination of hepa filtration, high numbers of air changes per hour (>12 ach), and minimal leakage of air into the room creates an environment that can safely accommodate patients who have undergone allogeneic hematopoietic stem cell transplant (hsct). cdc.gov

  • over the long and difficult course of the vietnam war, the central intelligence agency provided extraordinary and mostly unheralded support to the us military. from 1964 to 1965, when the us military had few sar aircraft in the region, air america rescued 21 american pilots. although the us air force did not continue to publish further statistics on air america rescues and the cia never tracked such data, anecdotal information suggests that air america air crews saved scores and scores of american military airmen. often at great personal risk, they did so for their fellow flyers and for their country. cia.gov

  • 4. keep your air clean. air quality can also trigger breathlessness and other copd symptoms, says horovitz. and indoor air can sometimes be more polluted than the air outdoors. “make sure your indoor air is as clean as it can be by using a high-efficiency particulate air (hepa) filter.” these filters can remove as much as 99 percent of indoor air pollutants. other tips for improving indoor air include getting rid of wall-to-wall carpets and cleaning with green products or with natural cleaners like soap and water, baking soda, and vinegar. everydayhealth.com

  • air pressure: air has weight. air pressure is the weight of the air, or atmosphere, pushing down on earth. the closer you are to sea level, the higher the air pressure because there’s that much air above you. the higher you are, there is less air pressure. barometers measure air pressure. factmonster.com

  • keep that evoo on hand for more than cooking. instead of gel pads, i prefer using olive oil to treat sore, chapped nipples. simply dab a bit onto each nipple after a feed or pump and let air dry. it can help tremendously, and it’s cheaper and (typically) less allergenic than lanolin-based nipple creams. healthline.com

  • federal, state, local, and private sector efforts to implement the original naaqs resulted in substantial improvements in air quality, yet notable problems remain. following the 1990 clean air act amendments, efforts were expanded to improve nationwide air quality and reduce related health effects. in conjunction with the strengthening of the ozone and particulate matter naaqs, epa has taken steps to integrate implementation measures for these pollutants and to improve the effectiveness of control programs. epa has also taken steps to inform the public about air pollution that may affect children. hhs.gov

  • air pressure: air has weight. air pressure is the weight of the air, or atmosphere, pushing down on earth. the closer you are to sea level, the higher the air pressure because there’s that much air above you. the higher you are, there is less air pressure. barometers measure air pressure. infoplease.com

  • 6. view looking southeast at ventilation equipment in south ventilation house. this air conditioning system was installed by parks-cramer company of fitchburg, massachusetts when the mill was constructed in 1923-24. one air washer and fan room exterior is visible on the right. the ducts from both fan rooms (curved metal structures at center and left of photo) are connected to a common air shaft. ... 1998 | 5 x 7 in.haer ga,143-hovi,6--6 | haer ga,143-hovi,6--6 loc.gov

  • airplane ear happens when there is an imbalance in the air pressure in your middle ear and the air pressure in the environment. this may happen when you’re in an airplane that is climbing or descending. a narrow passage called the eustachian tube regulates air pressure in your ear. when a plane climbs or descends, the air pressure changes quickly, and your eustachian tube often doesn’t react quickly enough. this can trigger airplane ear. mayoclinic.org

  • the biggest source of indoor air quality problems is central air conditioning, says jeffrey may, principal scientist at may indoor air investigations in tyngsborough, mass., and author of several books, including jeff may's healthy home tips. "with global warming, we use more air conditioning in most climates, and when you cool air, you reduce the temperature of the air and the humidity increases," he says. medicinenet.com

  • normally, the airways and air sacs in your lungs are elastic or stretchy. when you breathe in, the airways bring air to the air sacs. the air sacs fill up with air, like a small balloon. when you breathe out, the air sacs deflate, and the air goes out. if you have copd, less air flows in and out of your airways because of one or more problems: medlineplus.gov

  • "our findings provide new evidence that short-term exposure to air pollution may increase the risk of dying from asthma and highlight the need for those with asthma to take effective measures -- staying indoors with an air purifier or wearing a mask -- to reduce air pollution exposure when those levels are very high," liu said. medpagetoday.com

  • dynamic surfaces include alternating-air mattresses, low-air-loss mattresses, and air-fluidized mattresses. alternating-air mattresses have air cells that are alternately inflated and deflated by a pump, which shifts supportive pressure from site to site. low-air-loss mattresses are giant air-permeable pillows that are continuously inflated with air. the air flow has a drying effect on tissues. air-fluidized mattresses circulate air. they reduce moisture and provide cooling. dynamic surfaces are used if a pressure ulcer fails to heal when a static surface is used. merckmanuals.com

  • sources: air sports international; air sports international. population figures from world bank: (1) united nations population division. world population prospects, (2) united nations statistical division. population and vital statistics report (various years), (3) census reports and other statistical publications from national statistical offices, (4) eurostat: demographic statistics, (5) secretariat of the pacific community: statistics and demography programme, and (6) u.s. census bureau: international database. nationmaster.com

  • in addition, the 330-bed national centre for infectious diseases (ncid) had opened in 2019, which is a purpose-built centre for managing disease outbreaks. many of the lessons learnt from previous infectious disease outbreaks were incorporated into the design and construction of the building. some safety features include negative pressure isolation rooms, a single-pass airflow system without recirculation, separate air handling units to supply fresh air to different areas with filtration, and ultraviolet ray treatment of exhaust air. segregation of the flow of people and materials is demarcated, as well as management of waste materials. nih.gov