"Figure 13: Urban woodland removed the most harmful pollutant PM2.5 during 2017","" "Pollutant removed by habitat, urban green and blue space in Great Britain, 2017 ","" "","" "Notes","" "Unit","Tonnes" "","" "","Urban woodland","Urban grassland","Urban fresh or saltwater" "PM10","1.20","0.44","-0.004" "PM2.5","0.68","0.30","-0.003" "S02","0.33","0.56","0.027" "NH3 ","0.44","0.94","0.045" "NO2","0.38","1.49","0.000" "O3","5.01","17.06","-0.003"