Safe level of inhaled toxins must be revised by Government. A computer model showing how lungs inhale toxins and developed by Hungarian and Austrian scientists, shows that inhaled pesticides can collect at up to 400 times normal levels in certain parts of the lungs, especially at airway junctions (Journal Applied Physiology 2003:94). The accumulation of toxins at these sites is not fully understood but the implications for levels of pollutants and lung cancer are clear. The Government may need to look again at safe levels.