Most polluted cities in Assam, India

5 measured cities, last 30 days; 5 above the WHO 24-hour guideline. Worst: Dispur at 53.5 µg/m³, #22 in the world.

464 monitors in India haven't reported for more than two days. Cities that rely on them are missing from the 24-hour board and may drop from the longer ones; that isn't clean air, and they return when the data does.

About 0 people in this city breathed unhealthy air on an average day over the last 30 days.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.

1Guwahatilast full day 30 Sept 0

Good0–50

Moderate51–100

Sensitive groups101–150

Unhealthy151–200

Very unhealthy201–300

Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Assam cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City	7-day estimate	Band
Dibrugarh	≈ 21 µg/m³	Moderate
Jorhat	≈ 34 µg/m³	Moderate
Tinsukia	≈ 37 µg/m³	Unhealthy for sensitive groups
Tezpur	≈ 45 µg/m³	Unhealthy for sensitive groups
Bongaigaon	≈ 58 µg/m³	Unhealthy
Dhubri	≈ 58 µg/m³	Unhealthy
Diphu	≈ 23 µg/m³	Moderate
North Lakhimpur	≈ 26 µg/m³	Moderate
Karīmganj	≈ 38 µg/m³	Unhealthy for sensitive groups
Goālpāra	≈ 42 µg/m³	Unhealthy for sensitive groups
Barpeta	≈ 57 µg/m³	Unhealthy
Hāflong	≈ 21 µg/m³	Moderate
Golāghāt	≈ 27 µg/m³	Moderate
Bilāsipāra	≈ 58 µg/m³	Unhealthy
Hojāi	≈ 28 µg/m³	Moderate
Lanka	≈ 28 µg/m³	Moderate
Barpeta Road	≈ 58 µg/m³	Unhealthy
Kokrajhar	≈ 58 µg/m³	Unhealthy
Hailākāndi	≈ 38 µg/m³	Unhealthy for sensitive groups
Lumding Railway Colony	≈ 22 µg/m³	Moderate
Morigaon	≈ 48 µg/m³	Unhealthy for sensitive groups
Duliajan	≈ 34 µg/m³	Moderate
Duliajan Oil Town	≈ 34 µg/m³	Moderate
Rangia	≈ 51 µg/m³	Unhealthy for sensitive groups
Margherita	≈ 15 µg/m³	Moderate
Mangaldai	≈ 49 µg/m³	Unhealthy for sensitive groups
Silapathar	≈ 21 µg/m³	Moderate
Gauripur	≈ 58 µg/m³	Unhealthy
Mariāni	≈ 34 µg/m³	Moderate
Digboi	≈ 15 µg/m³	Moderate
Dum Duma	≈ 28 µg/m³	Moderate
Dhekiajuli	≈ 45 µg/m³	Unhealthy for sensitive groups
Dhing	≈ 48 µg/m³	Unhealthy for sensitive groups
Chāpar	≈ 58 µg/m³	Unhealthy
Dergaon	≈ 32 µg/m³	Moderate
Bokajān	≈ 23 µg/m³	Moderate
Sonāri	≈ 34 µg/m³	Moderate
Biswanath Chariali	≈ 37 µg/m³	Unhealthy for sensitive groups
Nahorkatiya	≈ 34 µg/m³	Moderate
Rangāpāra	≈ 45 µg/m³	Unhealthy for sensitive groups

Bad-air episodes in Assam

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

SmogRank, most polluted cities in Assam, India, PM2.5, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/in/region/assam?w=30d.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.