Geoscience Reference
In-Depth Information
3. Result and Discussion
Figure 1 shows the locations of the monitoring stations within the city
of Kolkata. From the runs done in Behala Chowrasta Figs. 2(a) and (b)
are some specific results, we find that the concentrations of the Chloride,
Sulphate, Nitrate, Aluminum, Iron, Calcium, and Lead are in the marginal
range, which can lead to health hazard. Three sources (HDT, LDT, MC)
are the main contributors in this zone. LDT contributes 61% of the total
source contribution for fine particles (
<
2
.
5
µ
m) and 74% for coarse (2.5-
10.9
µ
m) particle. Next major source is MC, which contributes 34% of fine
particle and 12% for coarse particle. So, the LDT source emission should
be controlled in that zone.
Figures 3(a) and (b) show some sample results at the Kharagpur site,
during the daytime, for December 2005. Nitrate, Sulphate, Chloride, Lead,
Calcium, and Aluminum are most prominent here. Five sources (UDUST,
CDUST, VBRN1, VBRN2, AUTPB) are the main contributors during day-
time sampling data at this site.
All the sources contribute more or less in the same proportion in both
coarse and the fine particle ranges. Among these sources only two, namely,
UDUST, and CDUST, contribute approximately 70% for both particle
ranges. So precaution is needed to minimize the effect of these sources.
Acknowledgments
We wish to thank the Indian Space Research Organisation (ISRO-GBP) for
their kind support to carry out the monitoring at the Kharagpur site and
the University Grants Commission, India for funding the entire project.
