In my home office, I started paying attention to CO₂ levels and humidity first. I noticed that when CO₂ spiked, my focus dropped quickly, and dry air gave me headaches. Temperature mattered too, but it was less dramatic than proper ventilation and keeping humidity around 40–50%. I found a few small devices useful to check levels regularly, and if you’re curious about options, you can see their air quality readers for practical examples. Simply monitoring these metrics made a noticeable difference: I felt more alert, had fewer irritations, and even my sleep improved slightly. Over time, adjusting ventilation, using a humidifier, and keeping an eye on CO₂ became part of a daily routine that actually supports both comfort and productivity.