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Formaldehyde (HCHO) is the most asked-about specific VOC. The Terrestream SEN66 does not measure, report, or detect it - do not use the device to check for formaldehyde. If you suspect it, get a dedicated test or professional advice.
Benzene (C₆H₆) is IARC Group 1, present in vape aerosol, traffic, attached garages, and wildfire smoke. The Terrestream SEN66 does not measure, report, or detect it - do not use the device to check for benzene. Only speciated lab testing can identify it; if you suspect benzene, seek professional testing or advice.
NH₃ from livestock and fertilizer is a major PM2.5 precursor. The outdoor feed does not carry ammonia itself; what the dashboard shows is the resulting outdoor PM2.5 from the Google Air Quality API.
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