Air Quality (Porto) slips 13.16% over 24 hours — now 33.00 n

Air Quality (Porto) is currently 33.00 n. Over 24 hours it has slipped 13.16%.

Change across timeframes:

• The past hour: ▲ 0.00% (33.00 n → 33.00 n) • 24 hours: ▼ 13.16% (38.00 n → 33.00 n)

In historical context: Air Quality (Porto)'s record high is 49.00 n, set 2 days ago (Jun 18, 2026); its record low is 32.00 n, today (Jun 20, 2026). It sits 32.7% below its record high and 6% of the way up its all-time range.

This tracker updates automatically every hour. The chart above plots the full reading history.

Source: News Never Sleeps datacenter — aggregated from public real-time data feeds (metric health.aqiOPO). Figures computed from 18 stored readings since Jun 18, 2026. No LLM, no opinion — generated automatically from the numbers.