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4.4 Dr Janczewski wrote that ASHRAE air quality committee:
… is comprised of various experts in environmental testing and evaluation, as well as a host of engineers. Reports and presentations provided by these committee members have shown aircraft cabin contaminant levels well below those likely to cause significant health effects. In addition, these experts continue to assert that there is a lack of evidence to support the theories being expressed. Using the most state-of the-art sampling strategies, and conducting continuous review of the data provided by committee members and outside studies, the data has failed to establish a recognised risk. 3
1 Jolanda N. Janczewski, IAQ on Passenger Planes , ASHRAE Journal, September 1999, p 18 2 Jolanda N. Janczewski, IAQ on Passenger Planes , ASHRAE Journal, September 1999, p 18 3 Jolanda N. Janczewski, IAQ on Passenger Planes , ASHRAE Journal, September 1999, p 18
4.5 The air quality committee carried out its air monitoring procedures on eight Boeing 777 commercial airline flights operated by a US carrier. The monitoring was performed between 9 and 22 July 1998. Sensors were used to detect a number of contaminants on board the aircraft including volatile organic compounds (VOC).4
4.6 In a document supplied to this Committee by ASHRAE it was stated:
Based on information collected during this study, including the air quality monitoring data, the responses to the comfort questionnaire and the information gathered during the literature search, there does not appear to be significant air quality-related health hazards present for either the passengers or the crew. However, this study was not an industry-wide evaluation involving different manufacturers, airlines and aircraft. The results from this project reflect a very narrow scope since it involved only one airline and one aircraft type. To fully assess the impact of cabin air quality, more research is needed to determine if significant health hazards are present and to identify solutions to correct problem areas.5
4.7 This document went on to note that:
Exposure to harmful concentrations of volatile organic compounds (VOCs) does not appear to present a significant health hazard for passengers or flight attendants. This study, as well as other published and unpublished data seem to indicate that concentrations of total VOCs are lower on aircraft than in other public environments. Also, other than the issue concerning the potential for hydraulic fluid entering the cabin … there does not appear to be sources present in the aircraft cabin that are likely to produce VOCs at levels that would result in significant health effects for the majority of the population. The most abundant VOC, especially on international flights, appears to be ethanol (approximately 80% of the TVOC), which is not a highly toxic inhalation hazard. The most obvious source of ethanol is associated with alcohol consumption of passengers. Two chemicals that posed a concern to the PMS were formaldehyde and acrolein. Both of these chemicals were measured during this study and the results indicated that acrolein was not present in detectable levels. and formaldehyde was present in very low levels (less than 5 ppb). More data needs to be collected on other types of aircraft to confirm that VOCs are not a significant health hazard onboard commercial aircraft. 6
　
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