Table 3:
Sound Metrics for Two Leaf Blowers and a Hose Vacuum By Distance (dB)*
| Distance (in feet) | Machine Combination Tested | Sound Metric | Mean (SD) | Range** |
|---|---|---|---|---|
| 0 | A+B+D | Background dB(A) | 64.2 | |
| LEQ dB | 106.4 | |||
| LAEQ dB(A) | 102.4 | |||
| Low Frequency dB | 102.4 | |||
| Mid Frequency dB | 103.6 | |||
| High Frequency dB | 95.7 | |||
| 50 | A+B+D | Background dB(A) | 59.7 | |
| LEQ dB | 97.6 (7.1) | 87.3 – 101.3 | ||
| LAEQ dB(A) | 85.5 (7.6) | 74.0 – 88.5 | ||
| Low Frequency dB | 97.6 (7.1) | 87.2 – 101.2 | ||
| Mid Frequency dB | 82.5 (7.2) | 71.6 – 84.6 | ||
| High Frequency dB | 74.7 (6.7) | 64.6 – 77.5 | ||
| 100 | A+C+D | Background dB(A) | 49.7 | |
| LEQ dB | 94.3 (5.5) | 86.7 – 97.6 | ||
| LAEQ dB(A) | 82.8 (7.0) | 72.3 – 85.4 | ||
| Low Frequency dB | 94.3 (5.4) | 86.7 – 97.4 | ||
| Mid Frequency dB | 80.1 (9.4) | 65.5 – 82.1 | ||
| High Frequency dB | 72.4 (10.4) | 56.1 – 74.5 | ||
| 200 | A+C+D | Background dB(A) | 47.6 | |
| LEQ dB | 85.2 (7.6) | 72.9 – 87.9 | ||
| LAEQ dB(A) | 72.9 (8.3) | 60.5 – 77.0 | ||
| Low Frequency dB | 84.0 (7.5) | 72.6 – 87.6 | ||
| Mid Frequency dB | 71.2 (9.2) | 57.9 – 76.2 | ||
| High Frequency dB | 61.3 (8.4) | 48.5 – 61.1 | ||
| 400 | A+C+D | Background dB(A) | 58.3 | |
| LEQ dB | 75.8 (1.1) | 74.3 – 76.5 | ||
| LAEQ dB(A) | 63.3 (2.2) | 60.5 – 64.9 | ||
| Low Frequency dB | 75.4 (1.0) | 74.3 – 76.3 | ||
| Mid Frequency dB | 60.4 (3.7) | 55.3 – 62.1 | ||
| High Frequency dB | 54.6 (6.3) | 47.1 – 58.7 | ||
| 800 | A+C+D | Background dB(A) | 54.7 | |
| LEQ | 68.5 (2.6) | 67.7 – 70.6 | ||
| LAEQ dB(A) | 57.3 (5.0) | 50.7 – 60.6 | ||
| Low Frequency dB | 67.9 (2.3) | 65.6 – 70.5 | ||
| Mid Frequency dB | 55.9 (7.3) | 44.9 – 59.5 | ||
| High Frequency dB | 50.4 (7.2) | 39.7 – 54.0 |
*
LAEQ is in dB(A);
**
Range: the minimum and maximum values obtained over 3 recordings at each distance interval
LF: Low frequency (<250 Hz); MF: medium frequency (250<Hz<2000 Hz); HF: high frequency (<2000 Hz)