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BINDU AND S. K. SINHA
Table 1: Air - quality data monitored at different stations at Dhanbad during 2007
Sampling SO 2
NO 2
RSPM SPM
location Min Max M ± SD Min Max M ± SD Min Max M ± SD Min Max M ± SD
J.S.P.C. 13.97 22.27 17.44±2.99 39.24 64.38 51.58±7.86 32.33 50.33 39.31±6.0 63 87.66 70.68 ±8.36
MADA 11.14 17.63 15.21±1.80 26.83 53.16 43.26±8.84 50.66 165.33 110.13±31.17 98 206.66 154.90±30.54
PDIL 12.40 21.18 14.93±2.82 36.66 49.04 42.18±3.44 45.33 118.33 83.3±23.16 83.66 156 115.50±24.71
Values in μg/m 3
Table 2: Air - quality data monitored at different stations at Dhanbad during 2008
Sampling SO 2
NO 2
RSPM SPM
location Min Max M±SD Min Max M ± SD Min Max M ± SD Min Max M ± SD
J.S.P.C. 8.80 29.29 17.31±4.05 32.45 103.32 41.49 ± 9.3 39.56 161 87.42±27.84 65.56 229 137.09±40.02
MADA 11.23 25.78 16.76±2.16 28.67 65.39 40.35±5.30 74.59 390 146.39±57.51 94.25 441 191.33±62.14
PDIL 6.98 23.47 16.80±6.27 31.09 62.22 43.52±7.34 33.11 118 83.35±30.13 57.88 166 122.97±35.12
Values in μg/m 3
absorbent by spectrometric analysis and for the estimation of
oxides of nitrogen (NOx) 0.1 N sodium hydroxide (NaOH)
solution with 0.4 % of sodium arsenate was used as absorbing
solution where it converts into nitrite ions. The nitrite content
is again estimated spectrophotometrically by the method of
IS: 5182 (Part-V).
The values of different parameters are continuous in nature
and one can take any value. In the current situation we need
to define a particular normal probability distribution using
only two parameters namely the mean (μ) and the standard
deviation (δ).
Normal Distribution is a continuous probability distribution
that describes data that cluster around the mean. The graph of
the associated probability density function is bell shaped, with
a single peak at mean and known as the Gausian function or
bell curve.
The confidence interval for the normal distribution taken is
95.45 % (μ-2δ