![]() ![]() In particular, it has been proved that the reliability of data provided by the LCSSs strongly depends on the environmental conditions of the location where they are going to be deployed. Despite the positive aspects concerning the LCSSs, such as cheapness, portability, and low power consumption, several studies found limitations in their use. The LCSS term refers to a wide range of sensors or devices based on various technologies: electrochemical, resistive, Non-Dispersive Infrared Radiation absorption (NDIR) sensors, and also optical counters for Particulate Matter (PM) detection,. In order to improve this situation, the use of Low-Cost Small commercial gas Sensors (LCSSs) has become more and more popular. For this reason in most cases, public authorities cannot afford the deployment of a sufficient number of these stations to achieve good spatio-temporal resolutions of air pollutant maps. Although they give accurate measurements, they are quite expensive, cumbersome, and require frequent maintenance. Nowadays, air quality monitoring is mostly performed by fixed stations based on Reference Instruments (RIs) such as chemical analyzers. ![]() One of the most concerning issues for public health is represented by atmospheric pollution. This system is therefore capable of providing a robust framework for environmental monitoring activities to researchers or low-skilled end-users. The modularity approach followed in SentinAir design constitutes another key factor to consider: it allows each user to easily adapt this device to his requirements. Moreover, the system proposed in this article provides a reasonably easy way to integrate a wide range of sensors or devices produced by diverse manufacturers, offering a tool that is not bound to the use of a limited and fixed set of sensors or devices. The high grade of flexibility featuring this tool enables the data acquisition from heterogeneous kinds of devices deployed far from the laboratory facilities, even in areas featured by a weak or unstable Internet connection. SentinAir has been designed to act as a portable air quality monitoring unit and also for facilitating the on-field evaluation and calibration of air quality sensors. ![]() The device presented in this article provides a cost-effective, expandable, flexible, open-source solution. However, in most cases, these monitoring systems lack flexibility, extendibility, and openness. As a result of these activities, various air quality monitoring systems have been developed following diverse approaches and methods. The company no longer develops Sketchup Make, its free desktop software, but you can download it from Trimble's archives.In recent years, several research projects have investigated the use of low-cost devices for air pollution monitoring. ![]() The SketchUp website offers a really impressive array of video and self-paced training options to help you along the way. Of course, if you're looking to put out detailed designs with accurate sizing and tolerances, you'll need to spend some time learning the ins and outs of the program. Even if you've never done any CAD work or 3D modeling before, you can pull together some really nice presentations in minutes. The interface makes it easy to get up to speed on the basics. SketchUp's free web-based version has plenty of power, but if you need additional functionality, you have to buy SketchUp Pro-and pay a hefty price tag. Trimble has enhanced it and developed it further and now offers a slew of related products. In 2012, Google sold the product to Trimble. SketchUp was originally developed by Google and was one of the greatest free CAD packages ever put on the market. Free feature is web-only with many important features hobbled. ![]()
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