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Portland residents woke up Tuesday to a familiar and unwelcome sign of Oregon’s intense wildfire season: a hazy skyline, muted views of the surrounding hills, and the smell of smoke hanging in the air.
By Tuesday afternoon, Portland’s air quality had deteriorated enough to rank fifth-worst among the major cities being tracked by IQAir at that time. The city’s AQI⁺ reading reached 156, placing conditions firmly in the “unhealthy” category.
Kinshasa, the capital of the Democratic Republic of the Congo, held the top spot for the world’s poorest air quality Tuesday afternoon. These international rankings can change quickly as weather patterns shift and pollution levels rise or
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