MQ135 Air Quality
MQ135 Air Quality
MQ135 Air Quality
MQ135 Air Quality

MQ135 Air Quality Sensor

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For home, environmental harmful gas detection device, suitable for ammonia, aromatic compounds, sulfur, benzene vapor, smoke and other gases harmful gas detection, gas sensors tested concentration range: 10 to 1000ppm.

  1. MQ135 sensor coupled with a simple adjustable comparator circuit using a LM393 IC.
  2. Detects Ammonia (NH3), Benzene, Sulfur, (SO2), Alcohol, CO2, Smoke and others in the air.
  3. Designed to interface to a Arduino or other micro controllers.
  4. Power: 5VDC
  5. Outputs: TTL Compatible Digital & Sensor Direct Analog
  6. 4 Pin .1in. Pitch Header pins for Power & Output
  7. LEDs for Output and Power status indication.
  8. Detection Zone: 10-300ppm

Getting started with the Air Quality Sensor (MQ-135)

Air quality check with Arduino Uno with the help of MQ135 Air Quality sensor. It is very useful in finding air quality.

Step1: Hardware required

Arduino Uno

Air Quality Sensor (MQ-135)

Step2: Connecting the Hardware

ARDUINO UNO                     MQ-135

Vcc                                                 Vcc

GND                                               GND

AO                                                    AO


Upload the code

int airquality = 0;
void setup()

void loop()

int sensorValue = analogRead(A0);
Serial.print(“Air Quality = “);


You can open up the serial monitor of Arduino for finding air quality as shown below:

When the air quality decreases, its value increases.

NOTE: IF you  get stray ‘\223’ errors The problem is with your  and  characters. Replace them with ordinary quotes, ", and you should be fine.

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