How Air Pollution and Weather Impact Asthma and COPD: Key Insights from a Study in Poland

Climate change and air pollution are growing threats to public health, especially for people with respiratory conditions like asthma and chronic obstructive pulmonary disease (COPD). A recent study conducted in Poland reveals how weather conditions and particulate matter in the air influence hospital admissions for asthma and COPD. This article breaks down the study’s findings in simple terms, showing how environmental factors impact respiratory health and why it is essential to monitor these conditions closely.

Understanding Asthma and COPD

What is Asthma?

Asthma is a long-term disease that affects the lungs and airways. It causes symptoms such as:

  • Wheezing (a whistling sound when breathing)
  • Shortness of breath
  • Chest tightness
  • Coughing, especially at night or early in the morning

Asthma is often triggered by allergens like pollen, dust, and pet dander, as well as environmental factors like air pollution.

What is COPD?

COPD is a group of lung diseases that make it hard to breathe. It includes chronic bronchitis and emphysema. Symptoms include:

  • Chronic cough with mucus
  • Shortness of breath
  • Frequent lung infections
  • Wheezing

Unlike asthma, the damage caused by COPD is usually permanent and gets worse over time.

Why Study Air Pollution and Weather Effects on Respiratory Health?

According to the World Health Organization, about 7 million people die every year due to air pollution. Particulate matter, especially PM2.5 (tiny particles less than 2.5 micrometers in diameter), is particularly harmful as it can enter deep into the lungs, causing inflammation and worsening respiratory diseases. The study highlights that PM2.5 levels above 25 micrograms per cubic meter are linked to a 1.4% to 2.5% increase in emergency hospital admissions for respiratory diseases.

Asthma affects approximately 235 million people worldwide, while COPD affects about 251 million people. The study aimed to understand how air pollution and weather conditions in northeastern Poland, where the climate is classified as warm-summer humid continental, affect hospital admissions for these diseases.

Study Details: Where and How It Was Conducted

The study was conducted at the Warmia and Mazury Centre for Pulmonary Diseases in Olsztyn, Poland, analyzing patient records from 2012 to 2021. It included:

  • 1419 asthma patients (550 males and 869 females)
  • 862 COPD patients (405 males and 457 females)
  • Patients were adults aged 18 and above, residing in Olsztyn.

Meteorological data such as temperature, humidity, wind speed, and precipitation were collected along with air pollution levels of PM2.5 and PM10 (particles less than 10 micrometers in diameter). The study also used the Humidex, an index that combines temperature and humidity to measure how hot it feels to the human body.

Key Findings of the Study

Seasonal Differences in Hospital Admissions

The study found that hospital admissions for asthma and COPD were higher in winter and lower in summer. This is due to:

  • Higher air pollution levels in winter from heating and vehicle emissions.
  • Extreme weather conditions, like cold waves in winter and heat waves in summer, impacting respiratory health.

During the winter months (January to March), PM2.5 levels exceeded the World Health Organization’s safe limit of 25 micrograms per cubic meter by four times, while PM10 levels were 2.5 times higher than the recommended limit.

In summer, high temperatures and humidity increased respiratory discomfort, leading to more hospital admissions. The Humidex values in July and August, which averaged 25.6°C and 25°C respectively, showed the highest hospital admission rates.

Impact of Air Pollution on Hospital Admissions

  • PM2.5 and PM10 levels were strongly linked to more hospital admissions for asthma and COPD.
  • PM10 contributed more to hospital admissions (45.6%) compared to PM2.5 (40.3%).
  • A 2.4 microgram per cubic meter increase in PM2.5 reduced lung function by 101.7 milliliters.
  • In February, PM2.5 levels averaged 27.1 micrograms per cubic meter, the highest in the study period.

Impact of Weather Conditions

  • Cold weather increased hospital admissions due to respiratory issues, with temperatures averaging -1.9°C in January.
  • High humidity and wind speed also played a role, with relative humidity averaging 78% annually.
  • The Humidex index showed a strong correlation with hospital admissions: 95.6% for asthma and 65.9% for COPD during summer months.

Statistics That Stand Out

  • 85.9% of asthma and COPD admissions were linked to air pollution.
  • PM10 contributed 45.6% and PM2.5 contributed 40.3% to respiratory admissions.
  • Winter PM2.5 levels were 4 times above the safe limit.
  • 32% of asthma and 29% of COPD admissions occurred during moderate thermal discomfort in summer.
  • A 2% increase in asthma admissions was observed on days with high PM10 levels, with a 4% increase after 7 days.
  • COPD admissions increased by 5% immediately after exposure to high PM10 levels, with effects lasting up to 10 days.

Practical Tips for Asthma and COPD Patients

  • Monitor Air Quality: Use air quality apps to stay informed about pollution levels.
  • Stay Indoors During High Pollution Days: Limit outdoor activities when pollution levels are high.
  • Use Air Purifiers: Clean indoor air can reduce exposure to pollutants.
  • Stay Hydrated and Cool in Summer: Drink plenty of water and avoid going out during peak heat.
  • Keep Warm in Winter: Dress in layers and use humidifiers to maintain indoor air quality.

Conclusion

It highlights the significant impact of air pollution and weather conditions on asthma and COPD hospital admissions. High levels of PM2.5 and PM10 during winter and thermal discomfort during summer increase respiratory risks. The Humidex index emerges as a valuable tool for predicting hospital admissions during summer months. As climate change continues to affect weather patterns and air quality, understanding these relationships is essential for protecting respiratory health and improving the quality of life for asthma and COPD patients.

This article is based entirely on the study “Impact of Seasonal Biometeorological Conditions and Particulate Matter on Asthma and COPD Hospital Admissions” published in Scientific Reports (2025).

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