A well-documented environmental trigger that sits outside THE FAD's five personal-lifestyle pillars.
This page is general education, not a diagnosis. If you're dealing with persistent or severe symptoms, please see a doctor — lifestyle tracking can be a useful complement to medical care, never a substitute for it.
Air pollution — particularly fine particulate matter (PM2.5) — is one of the more extensively studied environmental drivers of systemic inflammation, with research linking chronic exposure to cardiovascular and respiratory disease risk.
Unlike food, sleep, alcohol, exercise and stress, air quality is largely outside individual control — you can't simply "choose" cleaner air the way you might choose a different meal. It's included here for completeness and awareness, not as a THE FAD scoring input.
Checking local air quality index readings on high-pollution days, using air purifiers indoors where feasible, and avoiding outdoor exercise during poor air quality alerts are the more practical, individual-level responses available.
This is genuinely a public health and policy issue as much as a personal one — worth knowing about, without adding it to your personal list of things to feel you should be managing better.