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Global air pollution levels have likely passed their zenith - a pivotal environmental turning point that remains underappreciated in public discourse. This report examines the evidence for "peak air pollution," analyzes its drivers, identifies remaining challenges, and charts pathways to lock in these gains. Across developed economies and increasingly in emerging markets, key air pollutant emissions have plateaued or begun declining, despite growing populations and energy demands. This represents both a public health triumph and proof that environmental degradation is not an inevitable consequence of development. However, significant challenges remain with agricultural emissions, wildfires, and persistent pollution hotspots that continue to threaten human health and ecosystems.