In a controversial article, The Great Asbestos Hysteria (Mail, Feb. 23), we said that according to the Health and Safety Executive, the risks of white asbestos products are “insignificant” and “demonstrably zero” in the case of lung cancer.

The HSE assessments related to specific levels of exposure to white asbestos fibers, not white asbestos products, and found a risk of higher levels.

The article stated that asbestos in British schools is almost completely white. According to the HSE, the more harmful brown asbestos was also widely used in schools.

The writer was mistakenly mistaken that the HSE was forced to withdraw a series of commercials claiming that mesothelioma kills 4,500 a year.

In fact, the ads were based on an estimate of 4,000 deaths from all asbestos-related illnesses.