Most advice about lung health is written as though the air were the same all year. It isn't. The load on your airways rotates through a fairly predictable annual cycle, and once you can see the shape of it, a lot of things that felt random start making sense — why March always goes badly, why the first cold week brings a cough, why August feels heavier some years than others.
This is peak indoor season. Heating systems run constantly and strip moisture out of the air, sometimes down to levels you'd associate with a desert. Dry air thickens the mucus layer lining your airways, and thick mucus is harder for the cilia to shift, which is the mechanical reason winter mornings so often start with throat-clearing.
Windows stay shut, so ventilation drops and whatever is generated indoors — cooking particulate, cleaning product vapours, dust — hangs around longer. And people spend far more time inside together, which is most of the explanation for why respiratory infections cluster now.
Worth doing: a hygrometer and a humidifier, aiming for 30 to 50 percent. Crack a window while cooking even when it's cold.
Tree pollen first, grass pollen behind it. For anyone sensitive this is a months-long stretch rather than an event, and it's routinely mistaken for a cold that won't go away — the tell is itching, which infections don't usually cause.
Pollen seasons have been lengthening as growing seasons stretch, so the shape people remember from twenty years ago is not necessarily the shape now.
Worth doing: check counts before long outdoor stretches, shower and change after a day outside rather than carrying pollen into the bedroom, and keep car windows up with recirculation on.
Summer brings a pollutant that doesn't come out of a tailpipe directly. Ground-level ozone forms when sunlight reacts with traffic emissions, which is why it peaks on hot, still, sunny afternoons and why the worst readings are often mid-afternoon rather than rush hour.
Layered on top, increasingly, is wildfire particulate — dense PM2.5 that travels hundreds of miles and can degrade air quality in regions with no fire anywhere near them. For many people this is the season that made them install an air quality app in the first place.
Worth doing: on a high-ozone afternoon, either train early or train inside. Working hard raises how much air you pull in by a large multiple, which turns an ordinary hour outdoors into a much bigger dose of whatever happens to be out there.
Autumn has three overlapping things going on. Wet leaves and damp corners raise mould spore counts. Ragweed peaks across much of the country. And the heating goes on for the first time, pushing a summer's worth of settled dust through the ductwork and around the house in a single evening — which is why so many people get a mysterious cough the first cold week and assume they've caught something.
Worth doing: change HVAC filters before you first switch the heat on, not after. Deal with damp at the source rather than treating the surface repeatedly.
And the cycle closes. Sealed rooms, dry air, crowded gatherings.
Underneath everything already listed, and there is no point pretending otherwise. When the smoke rolls in, shutting a window and running a decent filter will always beat a supplement. And nothing on this page competes with simply not smoking.
What a daily spray offers is smaller and still real: a fixed point of attention that doesn't move with the season, built on three plant extracts with stated reasons for being there. The formula page sets out what the evidence does and doesn't show, including the gaps.
Four sprays a day, three named botanicals, sixty days to decide.
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