When the total traffic volume is the same, respectively the factor(s) which affect(s) the noise pollution level is/are
| Location | Total Traffic | % of Heavy Vehicles | Average Noise Level | Noise Pollution Level |
| I | 377 | 24.40 | 73.50 | 84.00 |
| II | 380 | 12.50 | 72.60 | 83.00 |
| III | 377 | 30.00 | 73.50 | 86.50 |
| IV | 225 | 12.50 | 72.98 | 80.90 |
When the total traffic volume is the same, respectively the factor(s) which affect(s) the noise pollution level is/are
(a) percentage of heavy vehicles
(b) noise pollution level and average noise level
(c) average noise level and % of heavy vehicles
(d) indeterminable on the basis of details given
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(a) For I and III, traffic volume is same. Since, Average Noise level is same for I and III and % of Heavy vehicles differs for I and III, so clearly % of Heavy vehicles affects the noise pollution level.
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