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.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

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

← Dispur 100% 75%0

Every measured city in Assam, India, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.

1Dispurlast full day 30 Sept 100%
2Nagaonlast full day 30 Sept 61%
3Silcharlast full day 30 Sept 0%
4Guwahatilast full day 30 Sept 0%
5Sibsāgarlast 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, 22:00 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 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.