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Several pollutants are considered to measure the AQI, including: PM2.5 (fine particulate matter) PM10 (coarse particles) Nitrogen dioxide (NO) Sulfur dioxide (SO) Ozone (O) Carbon monoxide (CO) Of all the particles listed above, PM2.5 particles are considered the most dangerous because they are small enough to penetrate deep into the lungs and even enter the bloodstream

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At the same time, compared to traditional ways of smoking, there is reduced exposure to pollutants

Realizing that technological and scientific skills were as important to the future of the Space Program as good pilots, NASA began a search for young scientists to serve as "mission specialists" on future space flights