​The Health Protection Department have monitored air quality since 1994. This initial monitoring involved nitrogen dioxide (NO2), volatile organic compounds (VOCs) and sulphur dioxide (SO2). However, in 2002 a Turnkey Osiris particle measurement unit was purchased which allowed real time particles measurement (PM10). This unit was sited on a balcony at the Southampton Hotel at the Weighbridge, St Helier. In 2004 a second unit was sited at the Market, Halkett Street, St Helier. Particles include dust and smoke and have a well documented respiratory effect on human health.