A factory releasing air pollution against an orange sky.

10 Cities to Avoid if You Have Asthma

Worst Cities with Air Pollution for Asthma

Environmental factors such as air pollution, allergens and humidity can significantly worsen asthma symptoms, making certain cities particularly challenging for individuals with asthma to live in. Below is a list of some of the worst cities in the USA for asthma, starting with those that have the most air pollution.

1. Los Angeles, California

Los Angeles frequently ranks as one of the worst cities for air quality due to its high levels of ozone and particle pollution. The city’s smog, largely caused by traffic emissions, industrial activities and its geography, traps pollutants in the atmosphere. For individuals with asthma, breathing in this polluted air can trigger flare-ups and exacerbate symptoms.

2. Bakersfield, California

Bakersfield consistently ranks among the most polluted cities in the United States. It suffers from poor air quality due to agricultural practices, oil drilling and emissions from vehicles. The surrounding mountains trap pollutants in the Central Valley, leading to dangerously high levels of particulate matter, which is harmful to people with asthma.

3. Phoenix, Arizona

Phoenix is known for its extreme heat and high ozone levels which can worsen asthma symptoms. Dust storms, known as haboobs, are also common in this desert city, adding fine particulate matter to the air and increasing the risk of asthma attacks.

4. Houston, Texas

Houston’s combination of heavy industrial activity and vehicle emissions makes it a challenging place for individuals with asthma. The city’s humid climate further exacerbates respiratory conditions by promoting the growth of mold and increasing the levels of allergens in the air.

5. Chicago, Illinois

Chicago’s air pollution, largely caused by industrial emissions and high traffic, ranks it as one of the worst cities for asthma sufferers. Cold winters bring additional challenges, as frigid air can constrict airways and trigger asthma attacks. Additionally, the city's high pollen counts during spring and summer pose problems for those with both asthma and allergies.

6. Memphis, Tennessee

Memphis has high pollen counts and frequent air quality alerts due to ozone levels. This combination makes it one of the most challenging cities for asthma patients. The humid climate also encourages mold growth, which can worsen symptoms.

7. Detroit, Michigan

Detroit faces a mix of industrial emissions and high levels of vehicle pollution. The city also struggles with elevated pollen levels during warmer months, creating a difficult environment for individuals with asthma.

8. Fresno, California

Fresno is another city in California’s Central Valley that faces significant air pollution challenges. Agricultural practices contribute to particulate matter, and the surrounding geography traps pollution, creating poor air quality that can trigger asthma symptoms.

9. Philadelphia, Pennsylvania

Philadelphia experiences frequent air quality issues due to industrial emissions and heavy traffic. Combined with high pollen counts in the spring and summer, the city can be especially tough for people managing asthma.

10. St. Louis, Missouri

St. Louis faces poor air quality caused by industrial activities and vehicle emissions. Seasonal allergens, including ragweed pollen, further aggravate asthma symptoms. Cold winters add another layer of difficulty, as dry, frigid air can constrict airways.

5 Cities That Are Good for People With Asthma

While some cities are notoriously bad for asthma, others offer cleaner air and fewer triggers, providing relief for individuals managing this condition.

1. Honolulu, Hawaii

Honolulu is known for its clean air and relatively low levels of allergens. The ocean breezes help disperse pollutants, and the city’s mild, stable climate reduces asthma triggers like extreme temperature changes and high humidity.

2. Burlington, Vermont

Burlington has excellent air quality and low pollution levels. Its cooler, less humid climate helps minimize mold and pollen counts, making it an asthma-friendly location.

3. Boise, Idaho

Boise offers a dry climate and clean air, with low levels of industrial pollution. The city’s geography, nestled in a valley but without significant pollution sources, helps keep air quality high year-round.

4. Cheyenne, Wyoming

Cheyenne benefits from a low population density, minimal industrial activity, and clean air. The city’s relatively dry climate also limits mold growth and pollen production, which can be beneficial for asthma sufferers.

5. Asheville, North Carolina

Asheville boasts clean mountain air and low levels of pollution. The city’s moderate climate and lower pollen counts compared to other southern cities make it a good choice for people with asthma.


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