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One of the important problems faced by many countries in the world is environmental pollution, the lack of monitoring points for air quality is one of the main environmental and technological challenges. In this scenario, the following question is presented: How much do citizens of a city know about the levels of air pollution they breathe? The Internet of Things (IoT) offers many benefits to be used and applied in the monitoring of environmental pollution. This research seeks to establish monitoring points to assess air pollution for a small city. We have developed low-cost devices with Arduino technology and a mobile application for Android, which allows us to collect information for analysis. The measurements were based on the levels defined by Hidromet ETESA and the decree of the Ministry of Economy and Finance, which indicate the permissible levels of polluting gases. Four variables were used for the study: carbon monoxide, carbon dioxide, humidity and temperature. The values generated from the analysis of the data showed that the concentrations in each place do not exceed the permissible

Measuring Air Pollution Through Small Sensors for Environmental Monitoring in Small Cities