Do your allergies seem worse than ever? Check out this pollen map

If you've been sniffling and sneezing more often than you're used to, you're definitely not alone. Numerous reports indicate allergy symptoms are more severe and lasting longer this year.

According to a national allergy map by Pollen.com, 40% of the country is currently experiencing "medium" levels of pollen, with an allergy index between 4.9 and 7.2.

Pollen counts are the worst in Texas and Oklahoma, along with portions of New Mexico, Arkansas and Louisiana. All of these regions are experiencing high pollen concentrations, with an allergy index between 9.7 and 12.

The map changes daily to reflect the current allergy conditions across the country. You can also enter your zip code and receive a personalized allergy report, which shows the top allergens in your area along with the upcoming forecast.

Earlier this year, AccuWeather meteorologists predicted an "intense and prolonged" pollen season for large parts of the country. So far, the forecast has tracked.

As for what's fueling the increase in allergy intensity this year, scientists say the changing climate has caused shifts in precipitation patterns, more frost-free days, warmer seasonal air temperatures, and more carbon dioxide in the atmosphere. These changes can lead to both higher pollen concentrations and earlier and longer pollen seasons, according to the U.S. Department of Health and Human Services .

"One study found that nationwide, total pollen amounts increased up to 21% between 1990 and 2018, with the greatest increases recorded in Texas and the Midwest," HHS noted.

There are three main types of pollen allergy: tree pollen allergy, grass pollen allergy, and weed pollen allergy, according to the Asthma and Allergy Foundation of America .

Tree pollen is the first pollen to appear each year, between February and May, and is responsible for most spring pollen allergy symptoms. Grass pollen usually appears in the late spring or early summer, between April and June. Weed pollen appears in the late summer and fall, between July and October.

Pollen affects health in many ways. It can trigger various allergic reactions, including sneezing, runny nose, and congestion; red, watery, or itchy eyes; and asthma or other respiratory illness exacerbation. These symptoms have been linked to negative impacts on sleep, daily activities, productivity, concentration and quality of life.

Allergic asthma and seasonal allergies affect approximately 40% of the U.S. population, according to HHS.