During the period 2018-2025, Delhi witnessed its lowest average PM10 and PM2.5 concentration levels in the current year, barring COVID year 2020.

• Delhi's annual average PM10 (198 µg/m³) and PM2.5 (97 µg/m³) in 2025 were the lowest in the 2018–2025 window, excluding the 2020 COVID lockdown year.
• Cited by MoEFCC as evidence of policy traction by the Commission for Air Quality Management in NCR & Adjoining Areas (CAQM) since its 2021 inception.
• UPSC relevance: intersects GS-III (environment/pollution), GS-II (statutory body, federalism), and Prelims (NAAQS, GRAP, NCAP, CAQM Act).