Long-run context

National history, not station weather.

Monthly national concentrations from OpenDOSM. This is context for the long run — it is not a station reading, not an hourly index and not a forecast. Station observations live in the station index.

Catalogue coverage

Jan 2017 — Dec 2024

96 monthly records · Malaysia

OpenDOSM source ↗

PM2.5

11.54

µg/m³ · Dec 2024

PM10

18.89

µg/m³ · Dec 2024

O₃

0.015

ppm · Dec 2024

NO₂

0.0067

ppm · Dec 2024

SO₂

0.0015

ppm · Dec 2024

0.536

ppm · Dec 2023

Two scales

Particulates and gases, kept apart

PM2.5 and PM10 are measured in micrograms per cubic metre. Gases are reported in parts per million. They share a source but not a scale, so they get separate axes.

Particulates

PM2.5 and PM10

µg/m³

Gases

O₃, NO₂, SO₂ and CO

ppm

What this page is

Monthly national concentrations published by the Department of Statistics Malaysia through OpenDOSM.
Useful for long-run context: seasonality, multi-year direction, and the difference between pollutant families.
Licensed CC BY 4.0; attribution is kept in the footer and source link.

What this page is not

Not a station series. The catalogue has no station dimension, so it is never used as station history.
Not comparable with the API. Concentrations are not converted to the Air Pollutant Index.
Not a forecast. There is no projection or alert built from these monthly values.

Gaps in a line are missing catalogue values, not zeroes. The chart never interpolates across a missing month.

Read the method Station observations

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