Abstract: Industrial environments are major sources of air pollution, emitting hazardous gases, dust, fumes, and toxic chemicals that pose serious risks to worker health and workplace productivity. This paper presents the design and implementation of an Eco-Friendly Industrial Air Purifier with Smart Monitoring — an Internet of Things (IoT)-enabled embedded system capable of continuous real-time air quality monitoring and automated air purification. The system is built around an ESP32 microcontroller interfaced with an MQ135 gas sensor for detecting harmful pollutants and a DHT11 sensor for measuring ambient temperature and humidity. When measured pollution levels exceed predefined safe thresholds, the system autonomously activates a 12V industrial air filter fan via a relay module, ensuring immediate air remediation. Environmental data comprising Air Quality Index (AQI), gas concentration, temperature, and relative humidity are transmitted wirelessly to the Blynk IoT mobile application, enabling remote monitoring and informed decision-making. The entire system is powered by a stable 12V, 2Ah Switch-Mode Power Supply (SMPS). Results demonstrate that the proposed system provides low-cost, scalable, and efficient air-quality management suitable for small to medium-scale industrial settings, including welding workshops, manufacturing units, laboratories, and pharmaceutical environments. The total hardware implementation cost is approximately INR 8,000, making it highly accessible for wide industrial adoption.

Keywords: IoT, ESP32, MQ135, DHT11, Air Quality Monitoring, Industrial Air Purifier, Blynk, Smart Monitoring, Embedded Systems, Relay Module

Downloads: | DOI: 10.17148/IARJSET.2026.13517