Development of low-cost ozone and nitrogen dioxide measurement instruments suitable for use in an air quality monitoring network

We demonstrate low-cost ozone and nitrogen dioxide measurement instruments suitable for use in an air quality monitoring network. The instruments are based on the gas response of tungstic oxide at elevated temperature. We have shown that with careful attention to detail, small, robust instruments can be made, with sensitivity for O₃ and NO₂ less than 10 part-per-billion (ppb), and which track reference analysers in the atmosphere to within 10 ppb over periods of months, without recalibration.