For how we live.
A case-crossover study in Kern County found the odds of coccidioidomycosis were about 12.5% higher in the 90 days after a new well was developed within 5 km of home.
A prospective, quasi-experimental study links the air-quality gains after China's 2013 Clean Air Act to an average 6.6-percentage-point reduction in predicted cardiovascular risk.
In nearly 12,000 US children, tree and park cover was linked to sharper directed attention and higher crystallized intelligence — and cleaner air seemed to explain part of it.
Analysing 4,504 German twins, researchers found the pollution–wellbeing link ran mostly between families, not within twin pairs — pointing to shared circumstances as much as the air itself.
The association was strongest where the air was worst — which is the tell. A parallel US survey finds the indoor facilities are the ones vanishing from low-income neighbourhoods.
A pooled analysis puts patient-reported rates at 13.9%, 8.0% and 12.0%. All of it is self-report, the heterogeneity is enormous, and the reviewers stop short of recommending avoidance.
Three successive birth cohorts over 22 years show falling prenatal pollution and rising test scores together. A separate review explains why the pathway from one to the other is still poorly mapped.
A review pooling prevalence across the region ties the projection to modifiable risks that are unusually common there — smoking, inactivity, diabetes — layered on rapid ageing.
A global modelling study puts four million new paediatric asthma cases a year on ambient nitrogen dioxide — and finds that 92% of them occur below the WHO guideline concentration.
A 34-million-birth analysis maps how far smoke travels from the fires that make it. A companion review is blunt that what that exposure does, beyond the lungs, is still unsettled.
Two February papers put respiratory virus activity into the models. One finds pollution effects amplified at peak influenza; the other finds them attenuated when rhinovirus is high.
A Utah case-crossover analysis found heat stress and pollution interacting synergistically in the warm season. A Louisiana crisis-hotline study traced hot nights to sleep disruption and unmet basic needs.
A 4.5-million-birth analysis found smoke exposure associated with higher birth weight, not lower. A separate cohort linked third-trimester smoke days to autism risk — but only when counting days, not concentration.
A January study forecasts particulate pollution across six Gulf states and reports Qatar highest at 87.90 µg/m³. The modelling is careful; the input data is annual, national and thirty-one points long.
Cedars-Sinai counted a 118% rise in general-illness visits and a 46% rise in heart attack visits over the 90 days after the fires started. Abnormal blood results more than doubled.
Emergency restrictions came into force on 13 December when the index passed 450. The more telling number is how many days the city has now spent in a category that was meant to be exceptional.
Berkeley researchers followed older Californians for a decade. Cumulative smoke exposure predicted death better than the number of smoke days did — which is not how air quality is usually reported.
A November systematic review screened 120 publications and found five eligible papers, all from the US and Canada. All pointed the same way; none could be pooled with the others.
The 2025 Lancet Countdown Latin America report tracks 41 indicators across 17 countries. Heat-related deaths are up 103%, and fewer than half the region's governments have finished a vulnerability assessment.
A global analysis separates exposure inequality from mortality inequality and finds they run in opposite directions between countries, and sometimes within them.
One projects 71,420 US deaths a year from wildfire smoke by 2050. The other projects 1.4 million globally by the end of the century, with Africa's burden rising elevenfold. Both rest on modelled chains, not observations.