Table of Contents

## What is LAeq noise?

Leq (or LAeq) is the Equivalent Continuous Sound Pressure Level. Equivalent Continuous Sound Pressure Level, or Leq/LAeq, is the constant noise level that would result in the same total sound energy being produced over a given period.

### What is LA10 noise level?

LA10 The noise level exceed for 10% of the 15 minute interval. This is commonly referred to as the average maximum noise level. LA90 The noise level exceeded for 90% of the sample period.

**What is L90 noise level?**

The L90(t) is a statistical descriptor of the sound level exceeded 90% of the time of the measurement period (t). This is considered to represent the background noise without the source in question.

**How is la10 calculated?**

Count the number of vehicles passing by the site during the interval for which L10 must be calculated. For example, to calculate L10(18 hr) count the number of vehicles during a given day, between 6 am and midnight. That is considered a representative 18-hour interval.

## What is the safe noise level for 8 hours?

90 dBA

OSHA sets legal limits on noise exposure in the workplace. These limits are based on a worker’s time weighted average over an 8 hour day. With noise, OSHA’s permissible exposure limit (PEL) is 90 dBA for all workers for an 8 hour day.

### What are LAeq and LAFmax?

LAeq,1s – An ‘A’ weighted 1 Second Leq value. LAeq,t – See Leq. LAF – The Sound Level with ‘A’ Frequency weighting and Fast Time weighting. LAFmax – The maximum Sound Level with ‘A’ Frequency weighting and Fast Time weighting during the measurement period.

**Is LAeq an average?**

Leq, LAeq, LAeq,t – Average Sound Level Usually measured A-weighted but there is no time constant applied. As the Leq (defined as the Equivalent Continuous Sound Level) is an average, it will settled to a steady value, making it much easier to read accurately than with a simple instantaneous Sound Level.

**What does LAeq DB mean?**

equivalent continuous sound level

Leq : equivalent continuous sound level is the sound level in decibels, having the same total sound energy as the fluctuating level measured. Leq is also known as the time-average sound level (LAT). LAeq is the A-weighted Leq sound level. LAeq,T is the A-weighted Leq, measured over a specified period of time (T)

## What does 85 dB sound like?

85 decibels is a noise or sound level equivalent to that of a food blender, heavy traffic while you are in the car, a noisy restaurant, or a cinema. As you can see, there are plenty of situations in everyday life when we are exposed to high noise levels.