Scientific air monitoring around the controversial Narangba Industrial Estate has found elevated levels of dust linked to serious health problems.

But despite warning about the dangers such tiny particles pose, the Environmental Protection Agency insists the heightened levels of so-called PM10 particles it measured in the air during testing at Narangba were unlikely to prove harmful to nearby residents or workers on the estate.

Environmental authorities around Australia regularly monitor emissions of PM10 particles because the material can enter the human respiratory system and penetrate deeply into the lungs, causing adverse effects.

The particles, measuring less than a hundredth of a millimetre in diameter and found in diesel exhausts and industrial emissions, are also thought to aggravate existing lung or heart problems.

The EPA detected raised levels of the particles in dust blown from land next to the Binary Chemicals plant.

The Binary facility was destroyed in a toxic fire in 2005, leaving contaminated water and land which has cost more than $9 million to clean up.

A monitoring program conducted over 10 months to August last year recorded four days when PM10 particles exceeded national environmental protection standards.

An EPA report on the program said two of these four instances were caused by activities on or near the land adjacent to the contaminated Binary site.

In a statement, the EPA said "such exceedences are unlikely to cause health issues".

The Courier-Mail reported on Saturday that another company on the estate, BCD Technologies, did not not have complete knowledge of the chemicals stored on its premises.

Residents have complained that housing development has been allowed to spread too close to the estate, situated north of the sprawling North Lakes development, 25km north of Brisbane's CBD.