Concerns pulp mill will change north-east rainfall

An environmental consultant has warned there will be a massive drop in rainfall in Tasmania's north-east if a proposed pulp mill goes ahead.

The Tasmanian Greens have commissioned Melbourne environmental consultant Aron Gingis to prepare a report on the impact of particulate pollution on the Tamar Valley and surrounding area as part of their submission on Gunns' planned mill.

Mr Gingis said the ultra fine particles emitted by the mill will change the density of clouds and reduce rainfall in the north-east by up to 80 per cent.

"They make clouds actually constipated, in other words the clouds simply changing their metrophysics and not precipitating or precipitating much less," Mr Gingis said.