Invisible gases and particles in the air you breathe.

We breathe in and out over 20,000 times a day, without knowing whether — or which — substances are in the air, where and how they arise, what effects they have on us, and what limit values exist. We’ve gathered the information on limit values for gases, particles and pollutants in indoor air for you.

air-Q and air-Q radon air quality monitors

These substances affect your health and wellbeing — learn everything about the quality of the air you breathe

Here you can learn about invisible gases and particles in the air you breathe. We explain how the various substances and compounds arise and what effect they have on you. You’ll also get an overview of the often complex definition of limit values, for example from the Federal Environment Agency or the WHO. From this, recommendations follow on how you can sustainably improve your indoor air.

Measured values & sensors

All measured values and sensors at a glance

Click on a measured value to see details, limit values and the matching air-Q variants.

Custom Sensor Custom Sensor Infrasound Infrasound H₂ Hydrogen VOC Volatile Organic Compounds C₄H₈S Tetrahydrothiophene T Air Temperature Td Dew Point NO Nitric Oxide NO₂ Nitrogen Dioxide SiH₄ Silane H₂Se Hydrogen Selenide H₂S Hydrogen Sulfide SO₂ Sulfur Dioxide O₂ Oxygen Rn Radon C₃H₆ Propylene COCl₂ Phosgene O₃ Ozone PH₃ Phosphine CH₄S Methanethiol / Methyl Mercaptan CH₄ Methane Merlin's Test Substance Merlin's Test Substance ρ Relative Humidity φ Absolute Humidity p Air Pressure lx Light / Illuminance Lp_max Noise Peak Level Lp Noise N₂O Nitrous Oxide (Dinitrogen Monoxide) CO Carbon Monoxide CO₂ Carbon Dioxide C₄H₁₀ Isobutane PID Industrial VOC Sensor N₂H₄ Hydrazine CH₂O Formaldehyde HF Hydrogen Fluoride F₂ Fluorine Particulate Matter Particle Count Particulate Matter Particle Count PM₁ – PM₂.₅ – PM₁₀ Particulate Matter C₂H₄O Ethylene Oxide C₂H₆ Ethane B₂H₆ Diborane ClO₂ Chlorine Dioxide Cl₂ Chlorine / Chlorine Gas C₄H₁₀ Butane HBr Hydrogen Bromide Br₂ Bromine HCN Hydrogen Cyanide AsH₃ Arsine NH₃ Ammonia Alcohols Alcohols

Monitor air quality, all air components, and environmental influences with the air-Q. For your health and performance.

Order the air-Q now