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iVANKY Official via Amazon [amazon.com] is has YNAK 16-in-1 Indoor Air Quality Monitor w/ 7″ HD Color Display, AQI & Alerts for $89.99 – $35 off w/ code D2DWU0NG at checkout = $54.99. Shipping is free.

Features:[LIST][*]16-in-1 Comprehensive Air Monitoring: Monitor 9 essential air parameters in real time—CO₂, PM2.5/PM1.0/PM10, HCHO, TVOC, temperature, humidity, and AQI—with 7 distinct AQI audible alerts for complete air safety awareness.