An investigation has found there is insufficient evidence to support claims methyl bromide exposure was to blame for four Port of Tauranga workers falling ill.
On March 8, four stevedore staff from ISO Limited were working about 100m from where stacks of logs were being fumigated with methyl bromide by Genera Ltd staff.
Fumigating company, Genera Ltd, was contracted by a number of parties to carry of methyl bromide fumigation of import containers, export containers and export timber as part of quarantine, import and export requirements.
Read more: Ballance Agri-Nutrients faces big fine for toxic gas cloud
Millions spent at fertiliser works to improve Tauranga air quality
Methyl bromide suspected as Tauranga port worker 'quarantined and decontaminated'
The workers later suffered symptoms including wheezing, abdominal pain, nausea, vomiting and general lethargy. All four visited hospital.