World Metrology Day (20 May 2026) — “Metrology: Building Trust in Policy Making”

What: Annual observance emphasizing measurement science in policy, trade, innovation and environment; jointly organised by OIML and BIPM; UNESCO recognition since 2023.

Significance:

• Policy design: Accurate measurement underpins evidence‑based policy and trust in statistics and standards.

UPSC relevance: Science policy, standards & measurement in governance.

Practice Q: Explain why metrology is critical for policy making and international trade.