Detecting poor Air Quality using MQ135. Complete tutorial : https://help.sinric.pro/pages/tutorials/air-quality-sensors/mq135.html

MQ135-Air-Quality-Levels.ino

#include <TroykaMQ.h> // https://github.com/amperka/TroykaMQ

#if defined(ESP8266)
  #define SENSOR_PIN        A0
#elif defined(ESP32) 
  #define SENSOR_PIN        34
#endif

MQ135 mq135(SENSOR_PIN);

const int AQI_THRESHOLD_SEVERE = 700;
const int AQI_THRESHOLD_VERY_POOR = 600;
const int AQI_THRESHOLD_POOR = 500;
const int AQI_THRESHOLD_MODERATE = 400;

int ppm = 0;

void setup() {
   Serial.begin(9600);
   // before calibrating the sensor, warm it up for 60 seconds calibrate the sensor in clean air
   mq135.calibrate();
   // if you know the resistance of the sensor in clean air
   // you can specify it manually, eg: 160 mq135.calibrate(160);   
   Serial.print("Ro = ");
   Serial.println(mq135.getRo());
}

void loop() {
   ppm = mq135.readCO2();
   
   if (ppm > AQI_THRESHOLD_SEVERE) {
    Serial.print("Air quality is SEVERE!");
   } else if (ppm > AQI_THRESHOLD_VERY_POOR) {
    Serial.print("Air quality is VERY POOR!");
   } else if (ppm > AQI_THRESHOLD_POOR) {
    Serial.print("Air quality is VERY POOR!");
   } else if (ppm > AQI_THRESHOLD_MODERATE) {
    Serial.print("Air quality is MODERATE");
   } else {
    Serial.print("Air quality is GOOD");
   }

   delay(1000);
}