SmogRank / Nigeria / Rivers State / Port Harcourt

Port Harcourt, month by month

Port Harcourt has a measured daily mean on 8 days since 4 October 2026.

Every month since 2026

2026too few days for a mean (a year needs 200)8 days measured

JanFebMarAprMayJunJulAugSepOct8 days

Each square is a month's mean PM2.5 in US AQI from Port Harcourt's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Port Harcourt marked; each year, the year's.

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

Months without a mean, and why

1 month

Month	Why
Oct 2026	8 of 12 days measured; a month needs 9. The others: 1 with readings for part of the day (a day needs 18 hours).

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Port Harcourt's worst days

Day	US AQI
8 Oct 2026	9834.1 µg/m³
9 Oct 2026	8929.4 µg/m³
4 Oct 2026	8829.0 µg/m³
5 Oct 2026	8527.4 µg/m³
6 Oct 2026	7622.6 µg/m³
10 Oct 2026	7421.7 µg/m³
7 Oct 2026	6114.4 µg/m³
11 Oct 2026	5310.1 µg/m³

Daily means, the highest since 4 Oct 2026; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Port Harcourt, Nigeria, 4 Oct 2026 – 11 Oct 2026. Monitor data from AirQo and AirGradient via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/ng/port-harcourt/history (accessed 12 Oct 2026).

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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.

Port Harcourt now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).