Air Quality Apps: How to Track Pollution Alongside Pressure
An air quality app is useful for headache tracking only if you understand three things about the number it shows you: which pollutant is driving it, how far away the measurement was taken, and whether the figure is a real observation or a model estimate. The composite index most apps display collapses several very different pollutants into one score by reporting whichever is worst, which means an index of 90 from ozone on a hot still afternoon and an index of 90 from fine particulate during a smoke episode are different exposures that may affect you differently. Tracking the index alone will blur exactly the distinction you are trying to find.
Combining air quality with barometric pressure in one log is genuinely worth doing, because the two are related in ways that create both real effects and false ones. Stagnant high-pressure conditions trap pollutants; frontal passages clear them. So pollution and pressure move together often enough that either one can appear to explain your symptoms when the other is responsible.
This is a guide to reading these apps critically and building a log that can actually distinguish between the two.