Are we getting greener? in The Complete France Post Bag Posted September 9, 2011 Spot on, Val.! There was a fascinating article in New Scientist a few years ago, saying the same thing. Children get fewer infections at an early age, so the wrong immune cells are stimulated first, which is thought to be a contributory factor in the bronchial inflammation of asthma. Also house-dust mites, one of the major triggers for asthma, are flourishing as never before in over-heated houses full of carpets and soft-furnishings.