AQMesh used to measure local air quality at Surrey school
Cleves School in Weybridge, Surrey (UK) has used AQMesh to measure pollution at the primary school’s entrance. The project, led by Dr. Edward Salter over the school’s summer term, aimed to understand exposure of the children (aged 7-11) to dangerous pollutant gases, with particular interest in the levels of nitrogen dioxide (NO2) and ozone (O3).
Initial findings showed that levels of O3 exceeded 100µg/m3 on several occasions during the high temperatures in June, and a daily pattern of gas peaks coinciding with school pick-up and drop-off was noticeable for nitric oxide (NO). NO2 levels increased later in the day both as a result of oxidation of school-related NO and from general traffic locally, with elevated levels of NO2 up to the end of the evening commute, probably from traffic on local and major roads nearby. The monitoring also showed 15-30 minute spikes from diesel buses or cars parked very early in the morning or late at night with their engines running constantly, as well as from local events at the weekend, when the air quality is otherwise generally seen to improve considerably.
The project set out to determine whether pollution peaked at school drop-off and pick-up times in order to encourage cleaner methods of getting to and from school, after a transport assessment for the expansion of the school highlighted that traffic peaked around 8.30am and 3.15pm for approximately 30 minutes. The school is reviewing findings and will consider a number of mitigation measures, including timing exercise sessions for periods of lower pollution.
AQMesh monitors were installed to monitor NO, NO2, NOx and O3 at each school gate during these peak traffic periods. “There is clearly an effect between pollution levels and travelling to school by car. If I were to do this again I would ask to monitor to additional gases, VOCs and particulates”, said Dr. Edward Salter. AQMesh can currently measure PM1, PM2.5, PM10, CO and SO2, as well as the three gases in this study, and options for H2S and CO2 are due to be released by the end of 2017.
“The AQMesh pods were simple enough for the school to handle, which is not true of all such equipment”, added Dr. Salter.
AQMesh was designed to offer a robust and easy-to-use air quality monitoring system that can deliver localised real-time readings, improving the accuracy and scope of gathering air quality data in order to support initiatives to reduce air pollution and its risk to human health.
AQMesh has been used in various education-related projects globally. At the simplest level AQMesh offers an accessible way for schoolchildren to engage with local air quality issues. Used in conjunction with wind speed and direction information, local real-time data from AQMesh can be used to distinguish between local sources of pollution, which can be managed, and more distant sources of pollution which require a different approach. AQMesh data can also be used to improve the accuracy of air quality models at the local level.