City Rankings Archive
The Pollen Atlas rankings archive holds a frozen snapshot of the daily city pollen rankings for every published date. Each snapshot is the rankings exactly as Pollen Atlas published them that day — the full table for every tracked city, the day's per-allergen leaders, and the methodology the figures were produced under — and it never changes after publication. For today's figures, see the city rankings.
The archive begins on Thursday, October 15, 2026. Its first day is a partial seed record: Thursday, October 15, 2026 carries each city's Total Pollen Index and dominant allergen, verified against that city's own page that evening; category readings were not retained for that date and are shown as not captured. Automated daily capture began with the snapshot for Tuesday, October 20, 2026; a new snapshot is frozen each day when the rankings rebuild at noon UTC. No snapshot was captured for October 16, 2026 – October 17, 2026; Monday, October 19, 2026. Gaps are stated here and never reconstructed.
- Tuesday, October 20, 2026
Pollen Atlas data shows two cities tied at the top of the October 20, 2026 rankings — Dallas, TX and Fort Worth, TX — each at a Total Pollen Index of 23 (Low), with ragweed as the dominant allergen in all two.
60 cities tracked
- Sunday, October 18, 2026
Pollen Atlas data shows seven cities tied at the top of the October 18, 2026 rankings — Baltimore, Dallas, Fort Worth, Fresno, Philadelphia, Sacramento and Washington, DC — each at a Total Pollen Index of 18 (Low), with ragweed as the dominant allergen in all seven.
60 cities tracked
- Thursday, October 15, 2026Partial seed record
Pollen Atlas data shows Tulsa, OK at a Total Pollen Index of 31 (Low) on October 15, 2026 — the highest in the country that day — while Dallas, Fort Worth, Houston, San Antonio and Austin all posted High ragweed readings.
56 cities tracked