Children monitored to gauge pollution impact
5 May 2015 Last updated at 07:05 BST
A multimillion pound study has been launched to assess the impact of the environment on the health and development of children.
For two weeks, more than 1,000 families from across Europe will monitor and log everything that they come into contact with inside and outside the home to measure the pollutants that they are absorbing.
Jayne McCubbin reports from Bradford.