CO₂ and Formaldehyde Check is a home visit service to assess levels of carbon dioxide and formaldehyde, one of the most common volatile organic compounds (VOCs) with an acrid smell. Although VOCs such as formaldehyde are indoor pollutants, they are widely used in home products including furniture, paints, cleaning solvents, fragrances, and moth balls. We will use specialised instruments to check concentration of CO₂ and formaldehyde and recommend actions for reducing exposure to indoor pollutants. High CO₂ concentration in the air can cause fatigue and concentration problems. Yet it is difficult to improve ventilation and air circulation in times of high heat and humidity. We will propose integrated solutions to improve ventilation and lower concentrations of CO₂ and indoor pollutants, while also controlling humidity to prevent mould growth.