https://blog.temboo.com/environmental-sensor-data-in-new-york-city-what-you-need-to-know/?utm_source=newsletter&utm_medium=sendy_email&utm_campaign=31_nyc_environmental_sensor_data_resend
https://www.hse.gov.uk/work-equipment-machinery/powered-gates/safety.htm
https://www.weintek.com/globalw/Product/Product_speccMTX_a.aspx
https://wiki.dfrobot.com/SKU_SEN0465toSEN0476_Gravity_Gas_Sensor_Calibrated_I2C_UART
https://www.dhfonline.org.uk/downloads/download-file-documents.asp?id=66&pos=0&dir=documents&ref=/pg/publications/26.htm
