This may not come as a surprise, but Sacramento and Stockton are among the worst places for allergies in the country.A Get the Facts Data Team analysis of data from Pollen.com, ranked Sacramento as No. 75 on a top 100 list of locations. Stockton was No. 83. In all, 10 cities in California made the list, with San Diego ranking as the No. 2 worst place for allergy sufferers so far this year. San Francisco was No. 11. You can see a national chart that shows high allergy levels across much of California below. See below for a closer look at the top 100 worst allergy cities across the country since 2023. These charts show that Sacramento ranked 23rd in 2025. Stockton was 24th. The Hearst Data Team spoke to experts who said that weather and climate are the biggest factors that are impacting a worsening allergy season. Warming temperatures and increased rainfall lead to increased plant growth, and those plants in turn produce more pollen.Both extreme rain and extreme drought can increase pollen loads, experts say. The rain provides plants with the humidity they love, and the drought means that pollen remains in the air longer.Additionally, the growing season for plants in the U.S. has gotten longer over the years, which leads to more opportunity for pollen production.Typically, areas in the southeast have the worst allergy seasons, but this year it’s been occurring in the west. Experts recommend that people monitor pollen counts and wear hats or sunglasses to keep pollen from getting into their eyes and mouth. They also recommend taking off shoes before getting inside and showering at night to avoid contaminating your bedsheets.See more coverage of top California stories here | Download our app | Subscribe to our morning newsletter | Find us on YouTube here and subscribe to our channelPHNjcmlwdCB0eXBlPSJ0ZXh0L2phdmFzY3JpcHQiPiFmdW5jdGlvbigpeyJ1c2Ugc3RyaWN0Ijt3aW5kb3cuYWRkRXZlbnRMaXN0ZW5lcigibWVzc2FnZSIsKGZ1bmN0aW9uKGUpe2lmKHZvaWQgMCE9PWUuZGF0YVsiZGF0YXdyYXBwZXItaGVpZ2h0Il0pe3ZhciB0PWRvY3VtZW50LnF1ZXJ5U2VsZWN0b3JBbGwoImlmcmFtZSIpO2Zvcih2YXIgYSBpbiBlLmRhdGFbImRhdGF3cmFwcGVyLWhlaWdodCJdKWZvcih2YXIgcj0wO3I8dC5sZW5ndGg7cisrKXtpZih0W3JdLmNvbnRlbnRXaW5kb3c9PT1lLnNvdXJjZSl0W3JdLnN0eWxlLmhlaWdodD1lLmRhdGFbImRhdGF3cmFwcGVyLWhlaWdodCJdW2FdKyJweCJ9fX0pKX0oKTs8L3NjcmlwdD4=

This may not come as a surprise, but Sacramento and Stockton are among the worst places for allergies in the country.

A Get the Facts Data Team analysis of data from Pollen.com, ranked Sacramento as No. 75 on a top 100 list of locations. Stockton was No. 83.

In all, 10 cities in California made the list, with San Diego ranking as the No. 2 worst place for allergy sufferers so far this year. San Francisco was No. 11.

You can see a national chart that shows high allergy levels across much of California below.

See below for a closer look at the top 100 worst allergy cities across the country since 2023.

These charts show that Sacramento ranked 23rd in 2025. Stockton was 24th.

The Hearst Data Team spoke to experts who said that weather and climate are the biggest factors that are impacting a worsening allergy season.

Warming temperatures and increased rainfall lead to increased plant growth, and those plants in turn produce more pollen.

Both extreme rain and extreme drought can increase pollen loads, experts say. The rain provides plants with the humidity they love, and the drought means that pollen remains in the air longer.

Additionally, the growing season for plants in the U.S. has gotten longer over the years, which leads to more opportunity for pollen production.

Typically, areas in the southeast have the worst allergy seasons, but this year it’s been occurring in the west.

Experts recommend that people monitor pollen counts and wear hats or sunglasses to keep pollen from getting into their eyes and mouth. They also recommend taking off shoes before getting inside and showering at night to avoid contaminating your bedsheets.

See more coverage of top California stories here | Download our app | Subscribe to our morning newsletter | Find us on YouTube here and subscribe to our channel