Original: In general they are sited in areas where we think air pollution may be at risk of going above Government air pollution objectives.
Simplified: In general they are sited in areas where we think air pollution may be at risk of going above Government air pollution targets.
Simplified: Generally, they are situated in areas where we think air pollution may be at risk of going above Government air pollution targets.
Simplified: In general they are in areas where we think air pollution may risk going above Government air pollution limits.