Christchurch told: Stay away from implosion
Those keen to view the first implosion of a building in New Zealand are being asked to watch it from home.
The 14-storey Radio Network Building in central Christchurch will become the first to be imploded in New Zealand at 8am on Sunday.
But demolition contractors Naylor Love and Ceres NZ have advised the public to stay home to watch it.
A public exclusion zone will be in place around the implosion site, with road closures on Madras, Gloucester and Worcester streets.
In a statement, the demolition companies said dust was an "unpreventable by-product'' of all types of demolition.
Dust from the implosion would be released over several seconds, but could linger in the area for up to six minutes.
Depending on wind speed and direction, the dust could potentially reach nearby properties, and the companies have advised the public to take the same precautions as they had been taking with dust generated by other demolitions in the city over the last 18 months.
The companies also advised those close to the implosion who found the dust to be uncomfortable or irritating, and anyone who had a respiratory condition that would be aggravated by dust, to stay indoors during the implosion.
All windows, doors and air intakes in the immediate vicinity should also be closed and other openings that could allow dust to enter a building should be covered.
Any exhaust fans in use in the immediate area should be turned off for up to 30 minutes.
Seismographs were being placed between the Radio Network House and nearby properties to measure the vibrations generated during the implosion.
The companies said a review of soil conditions in Christchurch and historic data indicated the vibrations generated would be below levels that could cause structural damage or even cosmetic damage.
However, people would be able to feel the vibrations.