For how we live.
Most people who presented did not have diagnosed asthma. The investigation into the 2016 epidemic thunderstorm asthma event identified who was at risk, and it was not who health services expected.
A detection-and-attribution study across 60 pollen stations found seasons 20 days longer and concentrations 21% higher since 1990 — and separated how much of that trend is anthropogenic.
Two birth cohorts totalling 9,801 children were sorted into eight developmental patterns. The classic progression was one of them, and one of the smallest.
A randomised trial gave one group unfiltered local honey and found no relief beyond placebo. A later trial found a benefit — using a dose of about 70 grams a day alongside an antihistamine.
A placebo-controlled trial in 164 children reduced fine particles 64% and found no improvement in symptoms. A smaller crossover trial found a benefit, but only in children whose asthma was poorly controlled.
Farm-raised children really are protected from asthma, and the mechanism has been traced to microbial exposure and innate immunity. What has not been shown is that household hygiene caused the allergy epidemic.
A European task force argued the first-generation drugs sold over the counter should not be. On symptom relief the newer ones differ from each other too — and the most familiar performed worst.
A 160-study meta-analysis found real but moderate symptom reductions while patients are on treatment. The evidence for lasting benefit after stopping is much thinner, and rests mainly on grass.