indoor air quality testing

https://getcommercialmoldremovalpulse.clearhavendigest.com/posts/commercial-mold-removal-protecting-your-business-and-your-people

My apartment started feeling stuffy and I was getting headaches, so I bought an indoor air quality testing kit. It measures things like humidity, CO2, and volatile organic compounds. The results were eye-opening—my living room had high CO2 levels from poor ventilation. Now I open windows regularly and use an air purifier. Testing made a big difference in how I feel.