Noxious Fumes Hotspots
Noxious Fumes level or dangerous smokes found in city streets has been so mounting.
A research led by Professor of Environmental Modeling Alison Tomlin at Leeds, has shown that air pollution levels change dramatically within small geographical areas – dependent on wind patterns, the location of traffic queues and the position and shapes of the surrounding buildings.
The research had shown that pollution hotspots tend to accumulate on the leeward side of the street (the sheltered side), in relation to the wind’s direction at roof-top level. They also revealed that the carbon monoxide levels were up to four times lower in parallel side streets, compared to the main road. “The mono oxide levels were highly variable over remarkably short distances, the junction itself showed high levels caused by queuing traffic but, with some wind patterns, these hotspots moved further down the street.
However, the leeward side of the street had consistently higher concentrations of carbon monoxide than the windward side.” said Professor Tomlin. It’s also found that pollution could be trapped within the streets emitted by re-circulating winds, but if it escapes above roof-top level it doesn’t tend to be mixed back into neighboring streets very strongly. The team says their researches has significance for local authorities and suggest other bodies monitoring air quality in urban areas.
