In Oslo, the opportunity of an interesting case study arose to evaluate the effects of emissions from vehicles running on alternative fuels as all buses on a particular bus line were running with high bioethanol blend (i.e. E95). Strong smell of acetic acid was already noticed as a negative side effect, and possible implications of bioethanol combustion on urban air quality were assumed. A study based on different types of measurement techniques was then carried out and the first results showed that the use of E95 blend as fuel for buses could have adverse impact on urban air quality, especially due to acetaldehyde, a hazardous compound that was measured and modelled at high concentration [6]. Acetaldehyde and acetic acid were identified as of concern based on ambient and on-line measurements during driving conditions of the E95 bus. Acetaldehyde was 1) measured at mixing ratio levels above 150 ppm in the exhaust of the E95 bus, 2) measured at higher ambient concentrations at locations exposed to the E95 buses than those not exposed, and 3) estimated to be above the threshold limit value at close distance to the bus.
The results obtained from the measurements carried out under on-road driving conditions have been reanalyzed and other organic compounds have been additionally identified and are reported in this study. Apart from ethanol,
In Oslo, the opportunity of an interesting case study arose to evaluate the effects of emissions from vehicles running on alternative fuels as all buses on a particular bus line were running with high bioethanol blend (i.e. E95). Strong smell of acetic acid was already noticed as a negative side effect, and possible implications of bioethanol combustion on urban air quality were assumed. A study based on different types of measurement techniques was then carried out and the first results showed that the use of E95 blend as fuel for buses could have adverse impact on urban air quality, especially due to acetaldehyde, a hazardous compound that was measured and modelled at high concentration [6]. Acetaldehyde and acetic acid were identified as of concern based on ambient and on-line measurements during driving conditions of the E95 bus. Acetaldehyde was 1) measured at mixing ratio levels above 150 ppm in the exhaust of the E95 bus, 2) measured at higher ambient concentrations at locations exposed to the E95 buses than those not exposed, and 3) estimated to be above the threshold limit value at close distance to the bus.The results obtained from the measurements carried out under on-road driving conditions have been reanalyzed and other organic compounds have been additionally identified and are reported in this study. Apart from ethanol,
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