Possible reason, alongside a better understanding, why we are continuing to see a rise in the diagnosis number of ADHD and other developmental problems.

While London is certainly not comparable to other Asian cities in its poor quality of air cleanliness, it has on several occasions failed to meet minimum required standards set by the EU.

“The current findings build on the Center’s previous studies linking prenatal PAH exposure with behavioral and cognitive issues, including associations with developmental delay at age 3, reduced IQ at age 5, and symptoms of anxiety/depression and attention problems at ages 6 and 7.”

Quote taken from full article available at

Source: http://www.medicalnewstoday.com/releases/284996.php?tw

EDIT...

Hours after this was posted, the London Evening Standard published this article regarding London air quality.

'London's air pollution 'is making thousands more people die early each year'

http://www.standard.co.uk/news/london/revealed-londons-toxic-air-is-making-thousands-more-people-die-early-each-year-10389902.html