No 5. IQAir GC MultiGas XE.
The IQAir GC MultiGas XE is the workhorse I trust when I care about both PM2.5 and gases—especially VOCs from things like cooking. I’ve used the GC line for years, and the XE upgrade adds a newer sensor plus an app experience that’s genuinely one of the most intuitive I’ve tested. It’s expensive and loud at max power, but the 10-year warranty and serious gas filtration make it a long-term investment that’s built to last.
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