=== Comparison Table: BME680 vs. BME688 ===
|<100% 20% 40% 40%>|
^Feature^BME680^BME688|
^Primary Focus|General Air Quality (IAQ)|Specific Gas Detection & AI|
^Gas Sensor Type|MOX (Metal Oxide)|Enhanced MOX with Gas Scanner
^AI Integration|None (Software-based IAQ only)|Integrated AI support (BME AI-Studio)|
^Gas Detection|Broad VOCs (Volatile Organic Compounds)|VOCs + VSCs (Volatile Sulfur Compounds)|
^Gas resistance range|Standard|Extended (for better discrimination)|
^Humidity Stability|Moderate cross-sensitivity (~15-25% error)|High stability (<5% error in high humidity)|
^Software Support|Basic BSEC library|BSEC + BME AI-Studio|
^Replacement Type|N/A|Backward compatible "//Drop-in//" replacement|

Since the BME688 and BME680 provide gas data as resistance in ohms (Ω), the value decreases as the air becomes more polluted. Here is how to interpret those ohm values for a typical indoor environment:

|<100% 20% 20% 60%>|
^Gas Resistance (Ω)^Air Quality^Interpretation|
^> 1,000,000 (1M+)|<color green>♦</color> Excellent|Very clean air. Typical for outdoors or well-ventilated rooms.|
^500k – 1,000k|<color orange>♦</color> Very Good|Fresh indoor air.|
^100k – 500k|<color yellow>♦</color> Good|Normal indoor environment.|
^50k – 100k|<color yellow>♦</color> Fair|Noticeable odors or VOCs (e.g., //cooking, cleaning products//).|
^10k – 50k|<color purple>♦</color> Poor|Significant pollution. Time to open a window.|
^< 10k|<color red>♦</color> Very Poor|High concentration of VOCs or gases (e.g., //heavy smoke or alcohol//).|