Loom Owning Households (%)
4.2 Comparison of noise level at handloom workstations .1 Noise levels compared pair wise across 12 months
The values (Mean ± SD) of the noise level at 2 different locations of the loom (workstation), viz. maximal and minimal noise levels near the right ear of the weaver (EMAX and EMIN respectively) and at the centre of the workstation (CMAX and CMIN
respectively) were shown in Table 4.8. The data reflected that there was a considerable variation in the noise level on the handloom as well as around the workstation. Noise level varied considerably and followed the increasing trend from Jan up to May (when it reached maximum), and thereafter decreased gradually till Aug. In Sep, it increased further and subsequently started decreasing up to Jan. The maximal noise was recorded
near the weaver’s right ear during May and minimal noise was noted at the centre of the work shed during Jan (Fig. 4.4).
Table 4.8 Noise level (dBA) measured on two locations in the handloom shed (Month Wise)
Month Jan Feb Mar Apr May Jun
EMAX
82.16±
3.31
86±
2.59
86.63 ± 1.20
87.9±
2.83
88.87 ± 2.87
87.11 ± 2.71 EMIN
44.01 ± 4.52
44.78 ± 4.67
46.63 ± 4.41
47.3±
4.98
48.94 ± 4.63
47.08 ± 4.72 CMAX
69.98 ± 5.81
71.72 ± 7.36
74.04 ± 6.28
74.66 ± 5.94
74.72 ± 5.77
74.06 ± 7.79 CMIN
39.19 ± 4.24
40.82 ± 4.21
42.24 ± 3.88
42.77 ± 4.94
42.94 ± 4.32
42.59 ± 4.51
Month Jul Aug Sep Oct Nov Dec
EMAX
86.6 ± 1.93
84.99 ± 2.62
86.46±
1.27
86.21 ± 2.87
83.73 ± 1.46
83.60 ± 1.50 EMIN
45.91 ± 4.61
45.64 ± 4.76
45.28 ± 4.63
44.83 ± 4.51
44.58 ± 4.1
44.25 ± 4.39 CMAX
73.78 ± 6.08
73.71 ± 5.47
73.61 ± 6.99
73.5 ± 6.01
71.68 ± 5.8
71.62 ± 6.69 CMIN
42.17 ± 4.35
42.12 ± 4.73
42.01 ± 4.53
41.55 ± 3.80
40.68 ± 4.35
40.04 ± 4.25 Values are expressed as Mean ± SD. EMAX – Maximum value of noise near the weaver’s Right ear; EMIN – Minimum value of noise near the weaver’s Right ear CMAX – Maximum value of noise in the center of the shed; CMIN – Minimum value of noise in the center of the shed.
Statistical interpretation is tabulated in Tables 4.9 – 4.12.
Fig. 4.4 Noise level (dBA) measured at different position of the handloom workstation (Month Wise). EMAX – Maximum value of noise near the weaver’s Right ear;
EMIN – Minimum value of noise near the weaver’s Right ear CMAX – Maximum value of noise in the centre of the shed; CMIN – Minimum value of noise in the centre of the shed. Values were expressed as Mean ± SD
Table 4.9 Comparison across 12 months between maximal noise (dBA) value near the ear (EMAX) and significance of difference between observations among different months of theyear
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan — *** *** *** *** *** *** *** *** *** NS NS Feb — *** *** *** *** *** *** *** NS *** ***
Mar — *** *** NS NS *** NS *** *** ***
Apr — ** *** *** *** *** *** *** ***
May — ** *** *** *** *** *** ***
Jun — NS *** NS *** *** ***
Jul — *** NS * *** ***
Aug — *** *** *** ***
Sep — * *** ***
Oct — *** ***
Nov — NS
Dec —
Significances expressed by * against the pair of months, where *, ** and *** denotes significant difference p ≤ 0.05, p ≤ 0.01 and p ≤ 0.001 respectively. NS - No significant difference (p > 0.05).
The analyses of maximal noise level near the ear of the weaver (EMAX) across the months (vide Table 4.9) revealed significant (p ≤ 0.001) differences in most of the cases.
Moreover, it was also observed that for Jul vs. Oct and Sep vs. Oct, the difference in noise level was significant at p ≤ 0.05 whereas the difference in noise level was significant at p ≤ 0.01 level for Apr vs. May and May vs. Jun. However, no significant (p
> 0.05) difference was observed while comparing the noise levels for Jan vs. Nov, Jan vs. Dec, Feb vs. Oct, Mar vs. Jun, Mar vs. Jul, Mar vs. Sep, Jun vs. Jul, Jun vs. Sep, Jul vs. Sep and Nov vs.Dec.
Table 4.10 Comparison across 12 months between minimal noise (dBA) value near the ear (EMIN) and significance of difference between observations among different months of the year
year.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Jan — *** *** *** *** *** *** *** *** *** ** NS
Feb — *** *** *** *** *** *** ** NS NS ***
Mar — NS *** NS *** *** *** *** *** ***
Apr — *** NS *** *** *** *** *** ***
May — *** *** *** *** *** *** ***
Jun — ** *** *** ** *** ***
Jul — NS *** *** *** ***
Aug — NS *** *** ***
Sep — ** *** **
Oct — NS ***
Nov — NS
Dec —
Significances expressed by * against the pair of months, where ** and *** denotes significant difference p ≤ 0.01 and p ≤ 0.001 respectively. NS – denotes No significant difference (p > 0.05).
NS - No significant difference (p > 0.05).
Analyses of the minimal noise level near the right ear (EMIN) of the weaver (vide Table 4.10) revealed significant (p ≤ 0.001) differences in most of the cases. However the difference was significant at p ≤ 0.01 for Jan vs. Nov; Feb vs. Sep; Jun vs. Jul; Jun vs. Oct; Sep vs. Oct and Sep vs. Dec; while no significant (p > 0.05) difference was observed during comparison of Jan vs. Dec, Feb vs. Oct, Feb vs. Nov, Mar vs. Apr, Mar vs. Jun, Apr vs. Jun, Jul vs. Aug, Aug vs. Sep, Oct vs. Nov and Nov vs. Dec.
The maximum noise level at the center of the handloom shed (CMAX) revealed significant (p < 0.001) difference between the noise level across different pairs of months (Table 4.11), except some cases with no significant (p > 0.05) difference for Feb vs.
Nov, Feb vs. Dec, Mar vs. Jun, Mar vs. Jul, Mar vs. Sep, Apr vs. May, Apr vs. Jun, May vs. Jun, Jul vs. Aug, Jul vs. Sep, Jul vs. Oct, Aug vs. Sep, Aug vs. Oct, Sep vs. Oct, and Nov vs. Dec.
Table 4.11 Comparison across 12 months between maximal noise (dBA) value at the centre of the work shed (CMAX) and significance of difference between observations among different months of the year
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan — *** *** *** *** *** *** *** *** *** *** ***
Feb — *** *** *** *** *** *** *** *** NS NS
Mar — *** *** NS NS *** NS *** *** ***
Apr — NS NS *** *** *** *** *** ***
May — NS *** *** *** *** *** ***
Jun — *** *** *** *** *** ***
Jul — NS NS NS *** ***
Aug — NS NS *** ***
Sep — NS *** ***
Oct — *** ***
Nov — NS
Dec —
Significances expressed by * against the pair of months, where *** denotes significant difference p ≤ 0.001 respectively. NS – No significant difference (p > 0.05).
Table 4.12 showed significance of difference between the minimal noise levels at the centre (CMIN) of the handloom work-shed across various pairs of months.
Table 4.12 Comparison across 12 months between minimal noise (dBA) value at the centre of the work shed (CMIN) and significance of difference between observations among different months of the year
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Jan — *** *** *** *** *** *** *** *** *** *** NS
Feb — *** *** *** *** *** *** *** *** NS ***
Mar — ** *** NS NS NS NS *** *** ***
Apr — NS NS *** *** *** *** *** ***
May — ** *** *** *** *** *** ***
Jun — NS NS * *** *** ***
Jul — NS NS *** *** ***
Aug — NS *** *** ***
Sep — ** *** ***
Oct — *** ***
Nov — NS
Dec —
Significances expressed by * against the pair of months, where *, ** and *** denotes significant difference p ≤ 0.05, p ≤ 0.01 and p ≤ 0.001 respectively. NS – No significant difference (p >
0.05).
The difference between the noise levels was significant (p < 0.001) across the pairs of the months except for Jun vs. Sep (p ≤ 0.05); for Mar vs. Apr, May vs. Jun and Sep vs. Oct (p ≤ 0.01) and for Jan vs. Dec, Feb vs. Nov, Mar vs. Jun, Mar vs. Jul, Mar vs.
Aug, Mar vs. Sep, Apr vs. May, Apr vs. Jun, Jun vs. Jul, Jun vs. Aug, Jul vs. Aug, Jul vs.
Sep, Aug vs. Sep and Nov vs. Dec (p > 0.05, not significant).
4.2.2 Variations in noise across seasons viz. summer (Mar-Jun), monsoon (Jul-Sep) and winter (Oct-Feb)
Maximal and minimal noise levels measured at two locations inside the handloom workstations viz. near the weavers’ right ear and at the center of the handloom shed across different climatic seasons and tabulated as Mean ± SD shown in Table 4.13. it could be understood that, maximal noise was perceived during the summer near the weaver’s right ear (EMAX, 87.62 ± 2.36 dBA), considered to be far above the recommended value of Indian Standards (75 dBA) for noise (Fig. 4.5), while the minimal recorded was during the winter at the centre of the shed (CMIN, 40.45 ± 4.24 dBA), a significant (p ≤ 0.001) difference of noise level was observed across all pairs of seasons at all positions during the year except in case of CMAX for summer vs. monsoon (p ≤ 0.05).
Table 4.13 Mean of the season wise noise value (dBA) at two locations of the handloom workstations with the significance level between observations among different climatic seasons
Season EMAX EMIN CMAX CMIN
Summer 87.62 ± 2.36 47.48 ± 4.26 74.37 ± 5.80 42.63 ± 3.96 Monsoon 86.02 ± 1.66 45.61 ± 3.61 73.70 ± 4.80 42.10 ± 3.51 Winter 84.34 ± 2.90 44.49 ± 4.44 71.70 ± 6.45 40.45 ± 4.24
Summer Vs Monsoon *** *** * ***
Summer Vs Winter *** *** *** ***
Monsoon Vs Winter *** *** *** ***
Values are expressed as Mean ± SD. Significance expressed by * and *** against the data, which indicated p ≤ 0.05 and p ≤ 0.001 respectively.
Fig. 4.5 Season wise noise value (dBA) at two locations in the handloom shed. Values are expressed as Mean ± SD
4.2.3 Comparison of Noise (yearly average level) of the loom workstation with recommended standard values
Table 4.14 Noise value (dBA) at two locations in the handloom shed for the whole year with recommended Standard level of Noise
Observation Point Noise Level (dBA) Recommended Standard level of Noise
EMAX 85.85 ± 2.21
Bureau of Indian Standards (BIS) – 45 to75 dBA
EMIN 45.77 ± 4.55
CMAX 73.09 ± 6.26
CMIN 41.59 ± 4.29
Values are expressed as Mean ± SD.
The noise level revealed, on an average across the year, maximal noise level near the right ear of the weaver (85.85 ± 2.21 dBA, Mean ± SD) as shown in Table 4.14, which was higher in comparison to the recommended Indian Standards (45 dBA to 75 dBA).
The noise level had wide and unstable deviation (Fig. 4.6) and the lowest value (41.59 ± 4.29 dBA) was observed at the center of the shed.
Fig. 4.6 Noise value (dBA) at two locations in the handloom shed for the whole year with recommended BIS Standard level of Noise. Values are expressed as Mean ± SD