Figures have revealed that one Liverpool road air pollution is 100 times worse than the average for the city.
A council spokesman said a vehicle tracking air quality across the city today measured pollution on a stretch of Speke Hall Avenue at 380 microgrammes of particulates per metre cubed, a figure they say is 100 times higher than average.
The vehicle has been commissioned by the council to check air quality around the city to mark Clean Air Day.
Officers hope the vehicle, which will track different areas of the city for 72 hours, will provide more information on pollution in the city .
It will supplement measurements collected on a monthly basis by the council at 146 monitoring locations across Liverpool.
Cabinet member for Environment James Noakes said the council was committed to improving the city's air.
He said: “The health impact of poor air quality is hugely damaging, especially on our children and our NHS which is why there is so much emphasis on monitoring so we can identify and tackle the hot spots - be it in the city centre or around schools.
“Clean Air Day is great opportunity to showcase what Liverpool is doing all the year round to improve our air quality now and for future generations - be it education packs and tree planting to redesigning the way the city centre is used by vehicles, cyclists and pedestrians.
The council spokesman said pollution levels can vary hugely even across relatively small geographical areas in the city - and that people in cars are likely to be exposed to far higher levels of pollution than those outside.
Liverpool is an Air Quality Management Area - and scientific research quoted by the council has found polluted air could contribute to 230 deaths a year in the city.
Councillor Noakes said a new city bus hub, part of the wider Liverpool City Centre Connectivity Scheme , would reduce unnecessary mileage and pollution from the city's buses.
The bus hub has proved controversial with some of its neighbours but was approved the the council's planning committee earlier this year, with work due to start on it next week.
