This week we tested the codes, individually, for the DHT22, PPD42NS, CCS811, and BME280 sensors. The latter sensor came on the same board as the CCS811 and allows us to measure altitude, atmospheric pressure, temperature, and humidity. Thus, we decided to use this sensor instead of the DHT22 sensor, as it is on the same board as the CCS811, allowing us to use fewer Arduino inputs. Additionally, we made the decision not to use the MQ-135 sensor, as it does not measure any parameters important to our work. After individually testing the codes, we combined them into one code that allows us to obtain readings from all sensors.