Residents staged a roadblock last week - their fourth in as many years - to protest the problem caused by up to 100 logging trucks which trundle past their properties each day.
Results from air quality monitoring on Wright Rd showed $532,000 of strip sealing in front of houses which WDC carried out last year had not worked.
Dust monitoring between February and March showed 11 exceedances of particulate matter 10 micrometres in diameter or less (PM10) - the standard used in national air quality standards. Legally, only one exceedance per calendar year was allowed. PM10 matter was a group 1 carcinogen, based on the increased risk of lung cancer.
"When you are living in a polluted environment the councils and the Government have the responsibility to obey the law," Ms Wright said.
About 3 kilometres of the road remained unsealed, and Ms Morgan said the council continued to lobby NZTA "at every opportunity - but we won't be the only council doing so", she said.
"If the Government steps up and funds [Pipiwai], it will have a deluge from elsewhere in the country," she said.
WDC contractors Fulton Hogan tried to grade the road at the start of December, but had to stop because it was too dry and dusty. Rain meant they were able to resume the job about a week later.
The roads were graded once a month as part of routine maintenance, and were wet-rolled twice during drier months.
The council expected to hear back from NZTA in March.