Air Quality & Particulate Matter Today: What You Need to Know and How to Protect Yourself

The quality of the air we breathe has a direct impact on our health and well-being. Terms like particulate matter, ozone, and the Air Quality Index (AQI) are often in the news, but what do they really mean for our daily lives? This guide helps you understand the data and take the right protective measures.

The Main Pollutants and the AQI

The Air Quality Index (AQI) is a composite value that assesses the concentration of several pollutants. Our app uses the European AQI, which ranges from 0 (very good) to over 100 (very poor). The main pollutants are:

• Particulate Matter (PM2.5 and PM10): Tiny particles from traffic, industry, and heating. PM2.5 particles are particularly dangerous as they can penetrate deep into the lungs.
• Ozone (O₃): At ground level, it is formed in summer through a chemical reaction between pollutants and strong sunlight. It is an irritant gas that affects the respiratory system.
• Nitrogen Dioxide (NO₂): Mainly from road traffic, it damages the respiratory tract.

How Weather Determines Air Quality

Weather and air quality are inextricably linked:

• Temperature Inversion: On calm, cold winter days, a layer of warmer air can trap colder, polluted air near the ground like a lid. This leads to sharply increased levels of particulate matter in cities.
• Summer Smog: On hot, sunny, and calm summer days, conditions are ideal for the formation of ozone. Ozone levels are typically highest in the late afternoon.
• Cleansing Effects: Strong wind disperses pollutants and lowers local concentrations. A heavy rain shower is the best "air washer" and effectively cleans the atmosphere of particulate matter and pollen.

Health Effects and Protective Measures by AQI Level

Recommendations are based on the AQI value, which is prominently displayed in our app:

• AQI 0-40 (Good to Fair): No restrictions for the general population. Enjoy outdoor activities.
• AQI 41-60 (Moderate): People with pre-existing respiratory or heart conditions, as well as young children and the elderly, should reduce intense and prolonged outdoor exertion.
• AQI 61-80 (Poor): Even healthy individuals may experience mild irritation. Strenuous outdoor activities (e.g., intense jogging) should be avoided. Move sports to the morning hours or indoors. Keep windows closed in heavily trafficked areas.
• AQI >80 (Very Poor): Significant health risks for everyone. Outdoor exertion should be avoided. Stay indoors as much as possible.

Practical Tips for Everyday Life

• Plan sports smartly: Use the hourly AQI forecast in our app. On days with high ozone levels, the early morning is the best time for sports before the sun reaches its full strength.
• Choose your route: When cycling or jogging, avoid main roads and opt for parks or side streets.
• Ventilate correctly: On days with high pollution, it's best to air out your home with short, powerful bursts (shock ventilation) rather than leaving windows tilted for a long time. The best times are often late at night or early in the morning.

A conscious approach to air quality is an important part of preventive health care. A quick glance at the AQI in your weather app can help you make the right decisions for yourself and your family.