MQ-135 Air Quality Gas Sensor Module for Arduino and Raspberry Pi
Couldn't load pickup availability
Have questions about this product? Our team is here to help — just reach out on WhatsApp.
💬 Contact Us on WhatsAppAbout the Product
MQ-135 Air Quality Gas Sensor Module | Multi-Gas Detection Module for Benzene, Alcohol, Smoke, CO and Airborne Contaminants — High-Sensitivity 10-1000 ppm Range with ≤1s Response Time for Arduino, Raspberry Pi and Embedded Air Quality Monitoring Systems
The MQ-135 Gas Sensor Module is the air-quality-focused member of the MQ family — designed for Arduino, Raspberry Pi, and embedded environmental monitoring. Detects various toxic gases including benzene, alcohol, smoke, and airborne contaminants with precision. The standard module for DIY air quality monitors, indoor air sensors, smart-home environmental dashboards, and educational electronics projects.
Offers resolution range of 10 to 1000 ppm for accurate readings across the practical range of indoor air quality monitoring. Sensitivity range of 2 KΩ to 20 KΩ in 100 ppm CO provides quantifiable concentration measurement. Accuracy ≥3% at typical operating points + response time ≤1 second support real-time air quality feedback for alarm logic. High sensitivity, rapid response time, and easy integration with microcontrollers via standard analog + digital outputs.
Typical Applications
- Indoor air quality monitoring — smart home dashboards, office air sensors.
- Smoke / CO alarms — DIY safety monitors complementing standard smoke detectors.
- Industrial gas leak detection — early-warning indicators for industrial benzene / alcohol exposure.
- Robotics safety — autonomous platforms in gas-exposure-risk environments.
- Educational electronics — teaching gas sensing, ADC, threshold detection.
- Environmental dashboards — combined with WiFi (ESP32 / ESP8266) for cloud telemetry.
MQ-135 Specifications
| Feature | Specification |
|---|---|
| Sensor | MQ-135 metal-oxide air quality sensor |
| Detection Capability | Benzene, alcohol, smoke, CO, airborne contaminants |
| Resolution Range | 10 to 1000 ppm |
| Sensitivity Range | 2 KΩ to 20 KΩ in 100 ppm CO |
| Accuracy | ≥ 3% |
| Response Time | ≤ 1 second |
| Output Types | Analog + Digital outputs |
| Compatibility | Arduino / Raspberry Pi / STM32 / ESP32 / generic MCU |
| Form Factor | Compact PCB module |
| Condition | Brand New |
FAQ — MQ-135 Gas Sensor
Q: MQ-135 vs MQ-2 — which to choose?
A: MQ-2 is the workhorse for combustible / flammable gas detection (LPG, methane, smoke, hydrogen). MQ-135 is tuned for air-quality sensing (benzene, alcohol, smoke, CO, airborne contaminants). For smoke / fire alarms: MQ-2. For indoor air quality dashboards: MQ-135. For comprehensive environmental monitoring, use both.
Q: Does it require burn-in / warm-up?
A: Yes — like all MQ family sensors, the MQ-135 needs a 24-hour initial burn-in for best stability. After that, typical warm-up before reading is 1-3 minutes from cold start. For battery-powered always-on systems, run the heater continuously.
Q: Can I use it for hard-rated commercial gas detection?
A: No — the MQ-135 is suitable for hobbyist, educational, and indicative monitoring. For commercial / industrial / life-safety applications, use certified gas detectors with calibration logs and regulatory approval (UL, CE-rated).
Q: Bulk pricing for production runs?
A: Yes — email contact@lys-sz.com with your quantity for tier pricing on educational kits or production deployments.
Related products
- MQ-2 Gas Sensor Module – Arduino / Raspberry Pi
- HC-SR501 PIR Motion Sensor – Arduino / RPi
- TCRT5000 IR Sensor Module – Smart Car / Robot
- ESP32-CAM WiFi Bluetooth Dev Board – OV2640
Educational kit makers or production OEMs stocking MQ-135 modules? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouses.
Buying in bulk for a mining farm or repair shop?
Get dedicated B2B pricing on this part and across our full catalog — quote response within 24 hours, payment by T/T USD bank wire, and DDP delivery available for US & EU customers (and other lanes on request).
