But it’s unclear what that means for cancer risk.
Of the 49 inks tested, only four complied with the European standards. Carcinogens were found in more than one-fifth of the samples, and in 83% of the black inks.
Chemicals that form in cooked food have been linked to cancer – but the full picture is more complicated.
Time to hang up?
The evidence appears contradictory – but there may be a good reason for this.
Coal dust can harm marine environments.
AAP Image/Dan Peled
Coal dust and oil can spread toxic chemicals hundreds of kilometres out to sea. But Australia's monitoring guidelines do not meet the standards used in countries such as the United States.
There are scores of carcinogens. Most aren’t as tasty.
WHO has said that processed meats cause cancer. But there are more, less visible carcinogens to worry about
Fracking in the US has relied on chemicals linked to a range of health problems but the industry claims UK operations would be far safer.
Eleven million cars worldwide could be affected by the scandal.
Volkswagen's cheating allowed its vehicles to pass rigorous emissions testing, giving customers maximum driving performance at the cost of the environment and our health.
No, we’re not swimming around in a soup of cancer-causing chemicals.
Cancer is caused by a combination of genetic and environmental influences – a kind of genetic lottery where the odds are stacked by environmental and lifestyle factors.
While we search for a cure, we are still searching for cause. A volunteer hangs bras during a promotion against breast cancer in Switzerland in 2008.
Major causes have been identified for most common cancers, like liver and lung. But we still haven't identified one for breast cancer.
So serious are the effects of air pollution on human health - the WHO recently categorised it as carcinogenic, responsible for 223,000 deaths a year worldwide - that it is easy to neglect its wider impact…
UC Berkeley’s School of Public Health has investigated 32 different lipsticks and lip glosses for potential health risk through…