Makers around the globe are building low-cost devices to monitor the environmentand with this hands-on guide, so can you. Through succinct tutorials, illustrationsand clear step-by-step instructions, you?ll learn how to create gadgets for examining the quality of our atmosphere, using Arduino and several inexpensive sensors. Detect harmful gases, dust particles such as smoke and smogand upper atmospheric haze?substances and conditions that are often invisible to your senses. You?ll also discover how to use the scientific method to help you learn even more from your atmospheric tests. Get up to speed on Arduino with a quick electronics primer Build a tropospheric gas sensor to detect carbon monoxide, LPG, butane, methane, benzeneand many other gases Create an LED Photometer to measure how much of the sun?s blue, greenand red light waves are penetrating