Word: soots
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...processing plants spew out a mixture of gaseous wastes containing about 800 tons of sulphur dioxide. As it rises into the air, the sulphur dioxide combines with water vapor and oxygen to form sulphuric acid. The minuscule droplets pick up more water and a variety of solid particles (e.g., soot, dust), until the City of the Angels wears, instead of a halo, a hat of dirty grey smog...
...months ago, the 2,000-tree lemon and orange grove of Gabriel Ramirez, near Valles, on the Pan American Highway, was a rich and blooming place. Last week, like most orchards in the lush, hot valley, Ramirez' trees were soot-black with the leaf-ravaging larvae of the mosca prieta (citrus black...
Girls getting off their rush-hour buses in downtown Jacksonville one morning last week noticed that the sidewalks were covered with particles of soot, which swirled up around their ankles. Hundreds looked down and found their nylons suddenly streaked with runs...
...Rogers, city health officer, went into action. The slaughter of nylons, he decided, was probably caused by acid-laden soot from low-grade fuel...
Next day the DuPont Co., maker of nylon, issued a somewhat huffy communique. Strong acids "degrade" (weaken) nylon yarn, and soot particles sometimes contain enough sulphuric acid to do the deed. But it does not happen often. Except to a few uncommon chemicals, DuPont insisted, nylon is at least as resistant as silk, rayon or cotton...