geographia - Studia

M. PĂTROESCU, CR. IOJĂ, D. ONOSE, G. VANAU, A. CUCU, R. CĂRCĂLE, C. CIOCĂNEA
Air quality indicator AQI presents an average of 107 (±63), that translates to
unhealthy air quality, potentially causing lung disease, building and vegetation degradation
(A. van den Elshout et al., 2008). With the exception of Lascăr and Dinamo monitoring
points, where AQI values are consistently under the average, the other monitoring points
are showing high values frequently, over the severely polluted air quality threshold (300).
The section Obor to Lizeanu is particulary concerned, as PM dispersion is difficult due to
the altimetry and configuration of the buildings (P. Kumar et al., 2008) (table 1).
If we set aside Obor crossroads, there is a 0.65 correlation coefficient between
traffic flow intensity and PM concentrations, confirming again the hypothesis that traffic
flow is the main source of PM in the study area. There is a similar level correlation
coefficient between traffic flow and the maximum AQI level, proving that high intensity
road traffic translates to poor quality air (C. Borrego et al., 2006).
Monitoring
point
PM spatial distribution and traffic flow alongside Stefan cel Mare Street
Average
vehicles per
hour
Table 1
PM
AQI
Traffic flow PM estimates (g/h)
(μg/m3) Average Maximum MOBILE6.2 PART5 EEC
1. Obor 2,254 103 257,5 640 - - -
2. Tunnel 4,708 70 174,0 363 42,7 22,5 37,2
3. Lizeanu 4,012 44 109,0 155 33,5 17,6 29,2
4. Cârţan 3,640 31 78,0 140 38,1 20,0 33,2
5. Grozovici 4,146 51 128,0 235 41,2 21,7 35,9
6. Lascar 4,024 18 45,0 95 41,2 21,7 35,9
7. Circului 4,330 49 123,0 223 44,9 23,6 39,2
8. Tunari 4,456 28 70,0 113 61,7 32,5 53,8
9. Dinamo 3,590 17 43,0 65 30,6 16,1 26,7
10. Floreasca 3,360 31 78,0 143 23,6 12,4 20,6
11. Dorobanţi 3,700 28 70,0 100 30,0 15,8 26,2
Average 3,838 43 107,0 206 387,5* 203,9* 337,9*
SD 663 25 63,0 166 15 8 13
* PM total quantity generated exclusively by mobile sources on Stefan cel Mare Street (per year and
per hour in kg); PM –Particulate matter concentration (maximum admissible limit – 50 μg/m 3 );
EEC – European Commission.
The PM quantity generated by the traffic flow on Ştefan cel Mare Street
assessment shows a daily output of 203.9 to 387.5 grams, underlining the substantial role of
traffic flow as a degrading air factor. The daily PM values do not correlate with hourly
measurements (0.19). This situation is due to the easier PM dispersion in open spaces
(Dinamo Stadium, Police Headquarters, Colentina Hospital) and to the proximity of one
and two level house area that further add PM into the air.
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