Section 2.1 (Site Layout Review) and Table 1 (Summary of Effects and Significance Prediction Comparison of Site Layouts)-- The revised layout adopted by the proponent appears to yield sound levels that should normally be below Health Canada's acceptable threshold value of 45 dBA for sleep disturbance at the exterior of the building of the nearest sensitive receptor (WHO, 1999). (wind-watch.org)
The study determined that 10 % was an «acceptable threshold for bee colony mortality», so countries that are above that - especially those that are significantly above that level - are definitely red flags that should be investigated: (treehugger.com)
Before the intervention residents performed at or above the acceptable threshold (demonstrating 6 of 9 behaviors) in 22 % of encounters. (pediatrics.aappublications.org)