International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 04 | Apr 2025
p-ISSN: 2395-0072
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Air and water pollution sensing smart watch M. Saraswath1, K.Chetan Kumar2, G. Susmitha 3, K.Narendra kumar4 G. Kumar5, Ch.Mahesh 6 1Assistant Professor & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY 2Student & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY 3Student & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY 4Student & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY 5Student & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY 6Student & AMRITA SAI INSTITUTE OF SCIENCE AND TECHNOLOGY
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Abstract -
rural areas. By transforming passive pollution awareness into proactive engagement, the smart watch empowers individuals to make informed decisions—such as avoiding polluted areas or reporting unsafe water sources—thus promoting both personal and community health. Moreover, its wearable form factor redefines the scope of environmental sensing by bringing it directly to the user, rather than requiring proximity to static measurement stations.
The rapid industrialization and urban expansion of the 21st century have significantly elevated levels of environmental pollution, posing a growing threat to public health and ecological sustainability. While traditional air and water quality monitoring infrastructures exist, they are typically stationary, cost-intensive, and inaccessible to the general population, particularly in under-resourced regions. This research introduces the design and development of an innovative, low-power, wearable device—a smart watch— engineered to provide real-time sensing and assessment of both air and water quality parameters. Compact in form yet powerful in function, the proposed device leverages a suite of low-cost environmental sensors integrated with an ESP32 microcontroller and an OLED display to deliver accessible, onthe-go pollution monitoring.
In summary, this research presents a novel fusion of embedded systems and environmental science, culminating in a wearable solution that democratizes pollution monitoring. The Air and Water Pollution Sensing Smart Watch stands as a pioneering step toward ubiquitous, citizen-centric environmental intelligence, setting the stage for future developments in smart wearables and IoT-based environmental analytics. Keywords: Air pollution, Water pollution, Smart watch, Environmental monitoring, MQ135 sensor, Turbidity sensor, DHT11, OLED display, Wearable technology, IoT, Real-time sensing, ESP32, Portable device, Embedded systems, Low-cost monitoring
The smart watch employs an MQ135 gas sensor for air quality detection, primarily measuring levels of harmful gases such as CO₂, NH₃, benzene, and smoke particulates. Simultaneously, a turbidity sensor evaluates water clarity, identifying contamination by detecting suspended particulates and sediments. In addition, a DHT11 sensor measures ambient temperature to provide further context to environmental conditions. The acquired data is processed locally and visually rendered on a 128×64 OLED screen, allowing the user to instantly comprehend the air and water quality status in their immediate surroundings.
1.INTRODUCTION Environmental pollution has emerged as one of the most critical challenges of the modern era, with air and water contamination ranking among the most pressing threats to human health and ecological balance. The World Health Organization reports that air pollution is responsible for approximately seven million premature deaths globally each year, while unsafe water contributes to a range of diseases, particularly in developing regions. Despite the growing urgency of this issue, the majority of environmental monitoring systems remain centralized, expensive, and difficult to access for the average citizen. This gap between pollution awareness and personal action has created a compelling need for decentralized, portable, and userfriendly monitoring solutions.
The real-time measurements are interpreted using predefined thresholds: air quality is classified as "Fresh" or "Poor" based on MQ135 analog readings, while water quality is categorized as "Clear" or "Dirty" depending on turbidity sensor output. The intuitive user interface ensures that users of all technical backgrounds can easily understand the environmental parameters being displayed. The system also logs data through the serial monitor for debugging and future expansion toward cloud integration or mobile-based interfaces.
Technological advancements in the fields of microelectronics, sensor integration, and wireless communication have paved the way for the development of compact, cost-effective, and energy-efficient environmental
The proposed system is cost-effective, energy-efficient, and scalable, making it highly suitable for deployment in densely populated cities as well as remote, pollution-prone
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