Sheriff Jack W. Brandes. To serve and protect the citizens of Austin County and the great State of Texas and to preserve and protect the. Constitution of the United States of America, especially the Second Amendment, the Right to Bear Arms..
Integrating Sound Level Meter. In atmospheric sounding and noise pollution, ambient noise level (sometimes called background noise level, reference sound level, or room noise level) is the background sound pressure level at a given location, normally specified as a reference level to study a new intrusive sound source.
reviews (Babisch, 2008; Kaltenbach, et al., 2008) quantify the evidence linking chronic noise to. adverse health impacts in a dose-effect relationship. Overall, the evidence from these studies supports the hypothesis of certain adverse health. effects from environmental noise. The strongest evidence links exposure to noise above 60 dB(A) in the daytime and above 45 dB(A) at night to an increased incidence of arterial hypertension. Results also link noise above 60 dB(A) to an increased risk of myocardial infarction; at 70 dB(A) the. risk is over 20% higher than in the unexposed population.