Plants have been used as initial indicators, or monitors, of air pollutants around industrial sources for a long time (Heck, 1966). Sulfur dioxide (S02) was early identified as causing injury to field-grown plants (Thomas, 1951; Zimmerman & Hitchcock, 1956).
The next generation of end-use technologies must respond to growing demands for better indoor air quality, comfort, workmanship and durability. Priority technologies include advanced building energy management control systems, high efficiency.
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