Effect of ventilation on ammonia levels in cowhouses

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      <subfield code="a">The effect of ventilation on concentrations of ammonia in typical Finnish cowhouses was investigated. Temperature, relative humidity, and concentration of carbon dioxide also were measured. A tracer-gas technique and multipoint equipment measured ventilation. Samples for airborne ammonia were collected in impinger flasks and analyzed by a gas-specific electrode</subfield>
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      <subfield code="a">American Industrial Hygiene Association journal</subfield>
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      <subfield code="t">American Industrial Hygiene Association journal</subfield>
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      <subfield code="g">Vol. 54, nº 11, November 1993 ; p. 678-682</subfield>
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