pm2.5

Fetched 2026-10-26 (cache).

Synonyms: pm25

Antonyms: pm25

Related words from Datamuse; suggestions, not definitions.

Proper noun

1. {{initialism of|en|[[particulate matter]] 2.5}}, a [[pollution]] [[measurement]] of [[particle]]s with a maximum diameter of 2.5 µm.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.