Experts discover the cleanest air on Earth

Vocabulary: boundary /BOUN-duh-ree/ [noun] — a real or imagined line that marks the edge or limit of something Mount Everest marks the boundary between China and Nepal. scrutinize /SKROOT-n-ahyz/ [verb] — to examine something very carefully in order to discover information They scrutinized all canned goods to see if they are poisonous as written in the report. isolated /AHY-suh-ley-tid/ [adjective] — not near to other places The farm is isolated; the nearest house is 25 kilometers away. composition /kom-puh-ZISH-uh n/ [noun] — the parts, substances, etc. that something is made of The chemical composition of water is two hydrogen atoms and one oxygen atom. distinctness /dih-STINGKT-nes/ [noun] — the quality of…
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