What PM2.5 does to your lungs — and what actually cuts your dose

The AQI, in plain terms

• 0–50 good, 51–100 satisfactorybreathe and exercise normally.
• 101–200 moderatesensitive people (asthma, heart disease, kids, elders) should ease heavy outdoor effort.
• 201–300 poor, 301–400 very pooreveryone cuts outdoor exertion; sensitive groups stay in.
• 401–500 severeavoid outdoor activity; this is the mask-and-purifier zone.

WHO's safe yearly average for PM2.5 is just 5 µg/m³ — most Indian cities sit far above it, so the goal is reducing exposure, not chasing a perfect number.

Masks — only the right kind works

• A genuine N95 / FFP2 respirator filters at least 95% of fine particles — if it seals snugly with no gaps. Roughly ₹50–250 each. This is the only mask that meaningfully cuts PM2.5.
• Surgical and cloth masks do little against PM2.5 — the particles slip around the loose edges. Fine for droplets, near-useless for smog.

Tests, if symptoms persist

• Spirometry (lung function test)roughly ₹500–1,500, measures how well your lungs move air — useful for ongoing cough or breathlessness.
• Chest X-rayroughly ₹300–800, if a doctor needs to look further.

Costs are rough India ranges and vary by city, lab and time. A test is for persistent symptoms — not something to do every smog season.

Myth 1 — A cloth or surgical mask protects me from smog.

Against PM2.5, it barely helps. These particles are far smaller than the gaps around a loose mask. Only a well-fitting N95/FFP2 respirator filters fine particles — and only if it seals against your face without escaping air at the edges.

Myth 2 — Indoors I am safe, so I can relax.

Outdoor PM2.5 seeps inside; on a bad day, indoor air can be nearly as dirty unless you act. Keeping windows shut during peak pollution and running a purifier (or a DIY filter fan) is what actually makes 'indoors' safer.

Myth 3 — Air purifiers are a scam.

A purifier with a genuine HEPA filter, correctly sized for the room and run with doors shut, measurably lowers indoor PM2.5. It is not magic and does nothing for outdoor air — but for a child's bedroom on a severe night, it is one of the few things that clearly works.

Myth 4 — Steam, kadha or 'lung-cleansing' foods undo the damage.

Nothing you eat or inhale 'flushes' particles out of the lungs. A good diet supports overall health, but the only real lever is breathing less polluted air in the first place.

Myth 5 — Morning is the best time for a walk in winter.

On smoggy mornings, cold air traps pollution near the ground and PM2.5 often peaks early. A late-morning or afternoon walk, when levels ease, is usually the cleaner choice — check the AQI first.

You cannot fix the city's air alone, but you control your own dose. Think in layers: check, time, filter, protect the vulnerable.

See a doctor promptly for breathlessness, chest tightness, wheezing, or a cough that worsens or will not clear. Those are signals to be examined, not endured.

Step back and the honest picture is sobering but not hopeless. For much of India, polluted air is no longer a winter event — it is a year-round exposure that quietly shapes how long and how well people live. The numbers are large enough to be abstract, which is part of the problem: a harm spread thinly across millions of lungs does not feel as urgent as it is.

The deeper lesson is about scale. Personal steps — a good mask, a purifier, smart timing — are real and worth doing, especially for the vulnerable. But they are a seatbelt, not a cure. They lower your dose; they cannot clean the sky. The thing that actually moves the air everyone breathes is collective: cleaner fuels and transport, controls on construction dust and crop burning, and steady public pressure to treat clean air as a basic right rather than a seasonal complaint.

That is why this matters beyond any single AQI reading. The future of India's lungs will be decided less by which mask we buy and more by whether clean air becomes a shared expectation — something demanded of cities and governments, not just managed privately by those who can afford a purifier.

Until then, the balanced response is the empowering one: protect yourself and your family with what works, refuse the panic, refuse the denial, and add your voice to the demand for air worth breathing. Your doctor manages the symptoms; the rest of us, together, manage the air.