Smart Air has examined data from 2025 to generate the “10 Most Polluted Cities in Malaysia”. Are you staying in Malaysia and concerned about the harmful impacts of air pollution? If so, this article is for you!
Continue reading to discover a list of Malaysia’s most polluted cities, with annual PM2.5 levels measured in micrograms per cubic meter (µg/m³). It’s crucial to know that the WHO’s recommended annual limit is 5 micrograms.
Data Source: DOE
Rankings: Top 10 Most Polluted Cities in Malaysia in 2025
1. Shah Alam, Selangor (21.2 µg/m3)
2. Kuala Lumpur (20.6 µg/m3)
3. Klang, Selangor (19.8 µg/m3)
4. Perai (18.3 µg/m3)
5. Petaling Jaya (17.8 µg/m3)
6. Kuala Terengganu (17.3 µg/m3)
7. Ipoh (17.1 µg/m3)
8. Johor Bahru (16.5 µg/m3)
9. Seremban (16.3 µg/m3)
10. Kota Bharu (15.9 µg/m3)
Read more: The 15 Least Polluted Cities in the European Union
Subscribe to Smart Air on YouTube
Analysis: Most Polluted Cities in Malaysia
The PM2.5 levels in this list range from 12.8 µg/m³ (Kluang) to 21.2 µg/m³ (Shah Alam). Most cities cluster between 15–20 µg/m³, indicating relatively moderate and consistent air quality among urban areas. While these figures are lower than heavily polluted regional hotspots in Southeast Asia, they still exceed the WHO annual guideline of 5 µg/m³, meaning that even Malaysia’s cleaner cities are above optimal health standards.
Urban and industrial hubs such as Shah Alam, Kuala Lumpur, and Klang appear toward the higher end of this “lowest” list, likely reflecting traffic density, industrial activity, and urban development. Meanwhile, smaller or less industrialized cities such as Kluang, Alor Setar, and Malacca show comparatively lower PM2.5 levels.
Free Guide to Breathing Safe
Want to learn more about breathing clean air? Join thousands more and stay up to date on protecting your health.
