The MQ-135 Gas Sensor Module is a 32mm x 20mm x 27mm SnO2 semiconductor sensor with an analog interface, sensitive to NH3 (ammonia), alcohol, benzene, smoke, and CO2, operating at 5V DC, and detecting NH3 and alcohol across 10 to 300 ppm and benzene across 10 to 1,000 ppm. The mq135 gas sensor is fundamentally different from the combustible-gas MQ-5/MQ-6/MQ-9 series — instead of detecting LPG leaks, the MQ-135 is the classic indoor air quality sensor, responding to a broad range of pollutant gases commonly associated with poor indoor air, smoke, and chemical fumes.
The air quality sensor analog output reads on Arduino through a voltage divider, with the raw reading representing an overall “air quality index” influenced by whichever detectable gas is present in highest concentration — because the mq135 air quality sensor responds to NH3, alcohol, benzene, smoke, and CO2 simultaneously with different ppm ranges for each, a single voltage reading cannot isolate which specific gas caused a change. The gas sensor module like other MQ-series sensors requires heater warm-up time before stable readings. The mq135 gas sensor module is commonly calibrated against a clean-air baseline reading taken in fresh outdoor air.
the MQ-135 responds to multiple pollutant types without distinguishing them, it works well as a general air quality index indicator but cannot identify specific pollutant sources.Available from StemVolt, this MQ-135 gas sensor module is ideal for engineers and makers developing air quality monitoring, environmental sensing, and indoor pollution detection projects with reliable multi-gas measurement capabilities.
Related Products:
- Checkout The MQ-2 Smoke Flammable Gas Sensor Module
Features:
- Detects NH3, alcohol, benzene, smoke, and CO2 in one sensor
- 10-300ppm NH3/alcohol and 10-1000ppm benzene detection ranges
- Analog output represents overall air quality index, not single gas
- 5V DC with heater requires warm-up before stable readings
- Clean-air baseline calibration recommended for accurate index readings
Technical Specifications:
Applications:
- MQ-135 Sensor used for Arduino indoor air quality monitor build
- College project uses mq135 gas sensor for air pollution detection demo
- Smart home uses air quality sensor for India indoor air alert
- IoT monitor uses mq135 air quality sensor for AQI data logging
- Classroom uses gas sensor module for ventilation air quality demo
Package Includes:
- 1 x MQ-135 Gas Sensor Module
Prathamesh Patil –
Received this gas sensor module on time with neat packaging, air quality detection worked reliably and it was perfect for my school competition project.
Mandar Tendulkar –
On time delivery
Snehal Jadeja –
Packed neatly
Chinmay Sawant –
Online payment easy
Urvashi Chawla –
No disappointment at all