The air quality in your school can have a huge impact on learning

He finds that math scores went up by 0.20 standard deviations and English scores by 0.18 standard deviations, and the results hold up even when you control for “detailed student demographics, including residential ZIP Code fixed effects that help control for a student’s exposure to pollution at home.”

Source: Air filters create huge educational gains – Vox

Hopefully there will be more research done on the findings here. Right now, the measurement relies on standard tests. I’d like to see what effects the air filters had on things like staff and student attendance, for example.