What is the air quality trend in Waterloo?

Over the past 14 days, Waterloo had an average AQI of 69 based on station measurements. The worst day was 2026-05-18 with AQI 97.

How is Waterloo air quality measured?

Air quality in Waterloo is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Waterloo, Sierra Leone

Name: Waterloo Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Waterloo, Sierra Leone.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

293h

PM2.5 Station

293h · 10 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-31	61	54–66	16.6 µg/m³	3h	10
2026-05-30	84	68–116	27.9 µg/m³	24h	10
2026-05-29	66	40–111	19.8 µg/m³	24h	10
2026-05-28	66	53–92	19.2 µg/m³	22h	10
2026-05-27	63	43–79	18.1 µg/m³	24h	10
2026-05-26	66	41–95	19.4 µg/m³	24h	10
2026-05-25	62	48–79	17.2 µg/m³	24h	10
2026-05-24	70	48–97	21.3 µg/m³	24h	10
2026-05-23	54	29–69	14.1 µg/m³	24h	10
2026-05-22	65	47–90	19.0 µg/m³	23h	11
2026-05-21	72	60–85	22.2 µg/m³	24h	10
2026-05-20	64	56–75	18.4 µg/m³	24h	8
2026-05-19	87	64–110	29.0 µg/m³	24h	6
2026-05-18	97	89–104	33.7 µg/m³	5h	4

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