Indoor air quality (IAQ) is very important to the tenants of a building because breathing polluted air can cause respiratory issues and other health problems. Dust particles, mold, and bacteria can thrive in a room with temperature and humidity that facilitate their growth. Air can also be polluted with volatile organic compounds and carbon monoxide. Wireless sensor networks (WSN) can monitor indoor air quality for gases, particles, humidity, and temperature. These all can affect tenant comfort and health. Through a simple smartphone app or desktop computer, the WSN nodes can communicate data through Wi-Fi. This is one of the latest Internet of things (IoT) developments.