addded: BME680 IAQ Class (#2593)

* addded: BME680 IAQ Class

* fixed: yaml layout

* fixed: some iaq values has result in an error

* Update bme680_bsec.rst

* Update bme680_bsec.rst

Co-authored-by: H. Árkosi Róbert <robreg@zsurob.hu>

components/sensor/bme680_bsec.rst

@@ -50,6 +50,7 @@ The :ref:`I²C <i2c>` is required to be set up in your configuration for this se
           name: "BME680 Humidity"
         iaq:
           name: "BME680 IAQ"
+          id: iaq
         co2_equivalent:
           name: "BME680 CO2 Equivalent"
         breath_voc_equivalent:
@@ -59,6 +60,35 @@ The :ref:`I²C <i2c>` is required to be set up in your configuration for this se
       - platform: bme680_bsec
         iaq_accuracy:
           name: "BME680 IAQ Accuracy"
+ 
+      - platform: template
+        name: "BME680 IAQ Classification"
+        icon: "mdi:checkbox-marked-circle-outline"
+        lambda: |-
+          if ( int(id(iaq).state) <= 50) {
+            return {"Excellent"};
+          }
+          else if (int(id(iaq).state) >= 51 && int(id(iaq).state) <= 100) {
+            return {"Good"};
+          }
+          else if (int(id(iaq).state) >= 101 && int(id(iaq).state) <= 150) {
+            return {"Lightly polluted"};
+          }
+          else if (int(id(iaq).state) >= 151 && int(id(iaq).state) <= 200) {
+            return {"Moderately polluted"};
+          }
+          else if (int(id(iaq).state) >= 201 && int(id(iaq).state) <= 250) {
+            return {"Heavily polluted"};
+          }
+          else if (int(id(iaq).state) >= 251 && int(id(iaq).state) <= 350) {
+            return {"Severely polluted"};
+          }
+          else if (int(id(iaq).state) >= 351) {
+            return {"Extremely polluted"};
+          }
+          else {
+            return {"error"};
+          }
 
 Configuration variables:
 
@@ -280,6 +310,7 @@ See Also
 - :ref:`sensor-filters`
 - :doc:`bme680`
 - :apiref:`bme680_bsec/bme680_bsec.h`
+- `BME680 VOC classification <https://community.bosch-sensortec.com/t5/MEMS-sensors-forum/BME680-VOC-classification/td-p/26154>`__
 - `BSEC Arduino Library <https://github.com/BoschSensortec/BSEC-Arduino-library>`__ by `Bosch Sensortec <https://www.bosch-sensortec.com/>`__
 - `Bosch Sensortec Community <https://community.bosch-sensortec.com/>`__
 - :ghedit:`Edit`