Developed using a Transport Canada model, NEF contours don’t measure decibel levels of individual flights. Instead, they’re a cumulative noise value of overall forecasted flights and nuisance factors, including loudness, frequency, duration, and time of occurrence.
Lines on a map connect points of equal noise impact representing 25, 30, 35, and 40 NEF contours. Transport Canada advises that n NEF level greater than 30 will produce some annoyance and that complaints above 35 will likely be more numerous.
To familiarise yourself with the previous and current NEF contours in the City of Leduc, as outlined in AVPA Regulations, please review the map below. The dotted line shows the previous contours, while the coloured sections show the new contours. The map is interactive. Please use the slider to see and understand the changes.