Angry residents of Beaufort Park demand protection from the pollution of the North Circular Road. - Credit: Alex Robinson Anxious families on the edge of Hampstead Garden Suburb are demanding action to protect their homes from air pollution from the North Circular and A1. Campaigners are petitioning Barnet Council to put in place measures including a "green wall" which could limit the impact of emissions from the roads, which surround the Beaufort Park apartment complex, near Henlys Corner. Alex Robinson, one of the people leading the campaign, said he first became aware of the scale of the problem around eight years ago.