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 further equipment was acquired which allowed particles measurement (PM10). Particles include dust and smoke and have a well documented respiratory effect on human health. 

 
Results for the period of 8 months in 2003 measured at the Weighbridge exceeded the EC and UK Air Quality objectives by 20 times. These objectives should be complied with by 2010 in the UK and allow only 7 exceedances per calendar year.