Dr. Anne Steinemann, Professor of Civil Engineering, and the Chair of Sustainable Cities, from the Department of Infrastructure Engineering, Melbourne School of Engineering, is a world expert on environmental pollutants, air quality, and health effects.

Professor Steinemann investigated and compared volatile organic compounds (VOCs) emitted from 37 different products, such as air fresheners, cleaning products, laundry supplies, and personal care products, including those with certifications and claims of 'green' and 'organic'. Both fragranced and fragrance-free products were tested.

The study, published in the journal Air Quality, Atmosphere and Health found 156 different VOCs emitted from the 37 products, with an average of 15 VOCs per product. Of these 156 VOCs, 42 are classified as toxic or hazardous under US federal laws, and each product emitted at least one of these chemicals.

Findings revealed that emissions of carcinogenic hazardous air pollutants from 'green' fragranced products were not significantly different from regular fragranced products.

In total, over 550 volatile ingredients were emitted from these products, but fewer than three percent were disclosed on any product label or material safety data sheet (MSDS).

"The paradox is that most of our exposure to air pollutants occurs indoors and a primary source is consumer products. But the public lacks full and accurate information on the ingredients in these products. Our indoor air environments are essentially unregulated and unmonitored," Professor Steinemann said.

The most common chemicals in fragranced products were terpenes, which were not in fragrance-free versions. Terpenes readily react with ozone in the air to generate a range of additional pollutants, such as formaldehyde and ultrafine particles.

At this time, consumer products sold in Australia, the US and around the world are not required to list all ingredients, or any ingredients in a chemical mixture called 'fragrance'.

"Given the lack of information, consumers may choose products with claims such as green, natural, or organic, but those claims are largely untested," Professor Steinemann said.

Professor Steinemann will continue to investigate how and why we're exposed to pollutants and ways to reduce risks and improve health.