Decibels are measured, most commonly, on the A, B, and C weighting scales. There is also a G-weighting scale that is used to measure infrasound (extreme bass frequencies below 20 Hz).
Decibel meters are impractical for gathering readings on boom cars, as the vehicles are often in motion. Plus, the operator of the decibel meter has to be adequately trained, the meter properly set up, calibrated, and maintained. Also, meters can be expensive.
For this reason, a ZERO TOLERANCEW law should be in effect for our cities and neighborhoods. This law simply states, ' A noise disturbance should NOT be acceptable at any hour of the day or night, detected past a business or residential property line or boundary, or heard outside of someone's vehicle.'
This is based on a plainly audible assessment and eliminates the use of decibel meters.
These are the most common decibel weighting scales.

	Most commonly used. Basically, it indicates how annoying a noise source might be. This scale underestimates annoyance levels for frequencies that occur below about 200 Hz and is less sensitive to very low and very high frequencies. Boom cars emit high-intensity/low frequency sound, which this scale will not record accurately. This scale is sensitive to soft sounds at around 40 dB. Designated by dBA or dB(A).
	Rarely used. It is sensitive to medium sounds around 70 dB. Designated as dBB or dB(B).
	Sensitive to loud sounds at 100 dB and above. Most closely corresponds to the unweighted measurement of SPL. Also picks up low-frequency sounds given off by artillery fire and outdoor rock concerts. Written as dBC or dB(C).

In a May of 2003 document titled, 'A Review of Published Research on Low Frequency Noise and its Effects,' Dr. Geoff Leventhall writes about the World Health Organization (WHO) and how it recognizes low frequency noise as an "environmental problem." Dr. Leventhall goes on to quote from WHO's publication on Community Noise (Berglund et al., 2000). These are some of those notations in regard to decibel readings and trying to properly record low frequency sounds. (As boom cars emit high-intensity/low-frequency sounds, which are excessive amounts of bass, this is especially important to note.)

• "For noise with a large proportion of low frequency sounds, a still lower guideline (than 30dBA) is recommended."
• "When prominent low frequency components are present, noise measures based on 'A' weighting are inappropriate."
• "Since 'A' weighting underestimates the sound pressure level of noise with low frequency components, a better assessment of health effects would be to use 'C' weighting."
• "It should be noted that a large proportion of low frequency components in a noise may increase considerably the adverse effects on health."
• "The evidence on low frequency noise is sufficiently strong to warrant immediate concern."

With their extreme decibel and low-frequency levels (bass), boom cars definitely exceed acceptable standards that ensure public safety, health, and welfare.