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- W2023987780 abstract "A new type of field exposure chamber for air pollution studies is described and its performance is evaluated. The chamber is designed to provide a steady downward air flow over a 2.44-m-diameter plot, with air venting laterally at soil level. It consists of a filter box above a 0.92-m-diameter fan in a housing mounted atop a conical welded steel frame. The fan is located 4.9 m above soil level. The frame enlarges from a diameter of 1.22 m at the top to 2.44 m at the base and is enclosed within a 0.5-mm (20-mil) polyvinylchloride cover terminated 20 cm above soil level. Activated charcoal and dust filters above the fan reduce the levels of ambient pollutants, particularly particulates and oxidants. Pollutant gases to be studied are introduced immediately below the fan to ensure mixing.Measurements of air velocity and the concentration of introduced pollutants indicate uniform distribution with considerable turbulence, while net radiation and temperature measurements indicate a small greenhouse effect due to the presence of the superstructure. The performance of the chamber is compared with others in use under field conditions." @default.
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- W2023987780 date "1978-04-01" @default.
- W2023987780 modified "2023-09-26" @default.
- W2023987780 title "A downdraft field chamber for studying the effects of air pollutants on plants" @default.
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- W2023987780 doi "https://doi.org/10.1139/b78-088" @default.
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