MANILA - Eleven cities in the Philippines were among the metros with the cleanest air in Southeast Asia, a Greenpeace report revealed Tuesday.

The 2018 World Air Quality Report looked at measurements of fine particles known as PM2.5, which can penetrate into the airways to cause respiratory problems.

Calamba City in Laguna topped the Philippine cities with an average of 9.3 PM2.5 last year.

Not all cities in the Philippines, however, were included in the report due to the absence or lack of information on air quality.

The following cities in the country were among those that have the cleanest air in Southeast Asia:

1. Calamba City
2. Valenzuela City
3. Carmona City
4. Parañaque City
5. Davao City
6. Makati City
7. Manila
8. Mandaluyong
9. Balanga
10. Quezon City
11. Las Piñas City

Meanwhile, Jakarta in Indonesia and Hanoi in Vietnam have the most polluted in Southeast Asia.

Worldwide, New Delhi, India again topped the list with the dirtiest air.

• India dominates list of world's most polluted cities

The report, compiled by Greenpeace and IQAir AirVisual, used air pollution data from tens of thousands of public and private monitoring stations across the world to rank over 3,000 cities from dirtiest down to cleanest. --With Agence France-Presse