With noise monitoring, part of the problem is that Pukekohe Park uses the methodology contained in the MSNZ Manual. This MSNZ regulation is :

"No vehicle may exceed 95 db(A). The measurement shall be taken 30 metres at a right angle from the track at a point where the vehicle is at maximum power. No compensation for differing climatic conditions shall be applied".

One of the problems with this is that MSNZ specifically excludes compensation for any climatic conditions. This stance is inconsistent with published New Zealand Standards and international procedures such as Nordtest.

Even Auckland Council in their noise monitoring of Western Springs Speedway note :

"Auckland Council Report on Noise Monitoring Western Springs Speedway" - "…. in addition to noise monitoring, meteorological conditions such as wind speed are observed. This is essential information to collect as weather conditions have a significant impact on noise levels.".

New Zealand Standards note that noise monitoring should only occur when the wind speed is between 0 and 5 m/s.

Against all of this MSNZ ignore all climatic conditions and this is likely to mean that results from using their methodology are suspect.

Additionally MSNZ's methodology ignores other accepted influencing factors such as road generated noise, residual noise, reflective noise from adjacent structures and amplified noise from hard surfaces (asphalt roads).