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F. Lenartz et al.
(i) sporadic exchange through a door, which opens according to a specific time
pattern, (ii) continuous exchange due to a lack of impermeability either with the
outside world or between the two considered rooms, and (iii) exchange through an
air conditioning system.
75.2.3 Exposure
In order to have a sufficiently large pool of subjects we made an open call to volunteers. Such a sampling strategy prevents us from determining a confidence interval
related to the estimated exposure level. Nevertheless, results can be extrapolated in
some ways via the so-called “typical units” or “quota” methods, and then potentially be compared with modelling output. Each subject carries the instruments for a
full week and is asked to fill in a questionnaire about his/her environment, as well as
his/her habits in some domains relevant to air quality issues. Furthermore, the subject
also has to fill in an activity and transport logbook to help us analyze the results.
75.3 Results
Very preliminary results of both outdoor and indoor models are shown in Figs. 75.3
and 75.4 respectively.
A one-week simulation of ambient NO 2 concentration was carried out using
AtmoStreet for the area of Liège. Although it is based on dummy emissions and
limited to a short time period, a typical pattern appears, highlighting both the valley
and the narrowness of some streets.
Several one-day simulations of the indoor BC level at the ground level of a cloth
store located along one of the city’s main boulevards. For most runs, the model was
able to represent adequately the concentrations observed in the main room—slightly
underestimating them in average.
Both tools need now a lot of validation work before comparison with actual
exposure measurements.
Questions
Questioner: Xuesong Zhang
Question: Once the calibration effort done, you could consider pushing these affordable instruments to other countries (e.g. developing ones) as their government and
institutions might be interested in such devices to monitor their local air quality.
Answer: Presently, we are testing and using our mini-stations in Wallonia. This
region has a temperate maritime climate and relatively low industry emissions, thus
we know nothing about their performance under more “extreme” conditions. We’ll
F. Lenartz et al.
(i) sporadic exchange through a door, which opens according to a specific time
pattern, (ii) continuous exchange due to a lack of impermeability either with the
outside world or between the two considered rooms, and (iii) exchange through an
air conditioning system.
75.2.3 Exposure
In order to have a sufficiently large pool of subjects we made an open call to volunteers. Such a sampling strategy prevents us from determining a confidence interval
related to the estimated exposure level. Nevertheless, results can be extrapolated in
some ways via the so-called “typical units” or “quota” methods, and then potentially be compared with modelling output. Each subject carries the instruments for a
full week and is asked to fill in a questionnaire about his/her environment, as well as
his/her habits in some domains relevant to air quality issues. Furthermore, the subject
also has to fill in an activity and transport logbook to help us analyze the results.
75.3 Results
Very preliminary results of both outdoor and indoor models are shown in Figs. 75.3
and 75.4 respectively.
A one-week simulation of ambient NO 2 concentration was carried out using
AtmoStreet for the area of Liège. Although it is based on dummy emissions and
limited to a short time period, a typical pattern appears, highlighting both the valley
and the narrowness of some streets.
Several one-day simulations of the indoor BC level at the ground level of a cloth
store located along one of the city’s main boulevards. For most runs, the model was
able to represent adequately the concentrations observed in the main room—slightly
underestimating them in average.
Both tools need now a lot of validation work before comparison with actual
exposure measurements.
Questions
Questioner: Xuesong Zhang
Question: Once the calibration effort done, you could consider pushing these affordable instruments to other countries (e.g. developing ones) as their government and
institutions might be interested in such devices to monitor their local air quality.
Answer: Presently, we are testing and using our mini-stations in Wallonia. This
region has a temperate maritime climate and relatively low industry emissions, thus
we know nothing about their performance under more “extreme” conditions. We’ll