Part 3 REQUIREMENTS PERTAINING TO GREEN CONTROLLED GROWTH England and Wales 19Interpretation 20Exceedance of air quality Level 2 Threshold or Limit 21Environmental Scrutiny Group 22Monitoring of permitted operations 23Exceedance of a Level 1 Threshold 24Exceedance of a Level 2 Threshold 25Exceedance of a Limit 26Review of implementation of this Part Part 3