PM2.5 is 5.6 µg/m³ here vs 12.4 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.12 h out ≈ 5.6/22 × 0.5 = 0.1 here; 12.4/22 × 0.5 = 0.3 at home.A health-impact equivalence, not literal smoking.See how we work it out →
▼ 6.8 µg/m³ less fine-particle pollution than Phoenix right now
PM2.5 is 5.8 µg/m³ here vs 12.4 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.12 h out ≈ 5.8/22 × 0.5 = 0.1 here; 12.4/22 × 0.5 = 0.3 at home.A health-impact equivalence, not literal smoking.See how we work it out →
▼ 6.6 µg/m³ less fine-particle pollution than Phoenix right now
PM2.5 is 7.8 µg/m³ here vs 12.4 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.12 h out ≈ 7.8/22 × 0.5 = 0.2 here; 12.4/22 × 0.5 = 0.3 at home.A health-impact equivalence, not literal smoking.See how we work it out →
▼ 4.6 µg/m³ less fine-particle pollution than Phoenix right now
PM2.5 is 8.2 µg/m³ here vs 12.4 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.12 h out ≈ 8.2/22 × 0.5 = 0.2 here; 12.4/22 × 0.5 = 0.3 at home.A health-impact equivalence, not literal smoking.See how we work it out →
▼ 4.2 µg/m³ less fine-particle pollution than Phoenix right now
PM2.5 is 16.2 µg/m³ here vs 12.4 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.12 h out ≈ 16.2/22 × 0.5 = 0.4 here; 12.4/22 × 0.5 = 0.3 at home.A health-impact equivalence, not literal smoking.See how we work it out →
PM2.5 is 20 µg/m³ here vs 12.4 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.12 h out ≈ 20/22 × 0.5 = 0.5 here; 12.4/22 × 0.5 = 0.3 at home.A health-impact equivalence, not literal smoking.See how we work it out →
Some particle pollutionLatest observation Jul 18, 5:00 p.m. EDT
Build-time readings shown
Air quality · Phoenix
Phew. Twelve hours out here is roughlyPM2.5 here is 12.4 µg/m³.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.12 h outside ≈ 12.4/22 × 0.5 = 0.3 cigarettes.A health-impact equivalence, not literal smoking.See how we work it out →
That is the fine-particle pollution you'd breathe standing outside all day inPhoenix right now, turned into a number your body already understands.
A health-impact equivalence, not literal smoking: Berkeley Earth puts a full day at 22 µg/m³ of PM2.5 at about one cigarette.How we work this out
Why live rankings?
Smoke plumes are patchy and move with changing winds, terrain and weather. Nearby lakefront, coastal and higher-elevation places can be much clearer than Phoenix, but no direction is reliably cleaner. That is why this list is recalculated from live PM2.5 readings every hour instead of publishing a fixed escape route. If everything within three hours is smoky, the rankings will say so. Sometimes the honest answer is to stay inside with a filter running.