Sydney's most 'toxic' suburbs revealed

Potentially dangerous levels of lead have been found in household dust in Sydney's inner west and CBD, according to new research.

Macquarie University scientists analysed dust sucked up by vacuum cleaners at 224 homes across greater Sydney for a variety of toxins, with some disturbing results.

Researchers estimate one in five toddlers aged between one and two potentially have elevated levels of lead accumulated via ingestion and inhalation of contaminated dust.

Lead poisoning can permanently disable children, lower IQ and trigger other diseases.

Among reasons given for higher concentrations of lead in dust in suburbs within 10km of the city are the presence of old homes with peeling or degrading lead paint, recent renovations, contaminated soil, traffic pollution and the legacy of decades of industry.

"It tells us a story about what's inside our homes as well as what's outside our homes, and its really interesting because our homes are accumulators and collectors many toxic elements," Professor Mark Taylor from Macquarie University said.

Researchers also tested for arsenic, chromium, zinc, nickel, copper and manganese as part of the global DustSafe citizen science project.

Families living in Campbelltown, the Sutherland Shire, Blacktown and Liverpool have among the lowest levels of toxic metal in their homes.

Measures families can take to reduce exposure to toxins in their home include having a 'no shoes' policy inside, dusting regularly with a wet rag, washing hands and faces regularly, wet mopping instead of dry sweeping, and using a vacuum cleaner with a HEPA filter. The Stevens family live in Summer Hill, where potentially hazardous lead was recorded at Sydney's highest levels.

Mother Naomi Stevens, said: "It's about making sure that you are protecting your family.

"Lead is one of those things it can have long term or permanent impacts."

The study has been published in the science journal Environment International.

More householders are needed. To take part in dust research, visit here.