The Air Quality Limit Values (Scotland) Regulations 2003 No. 428

SCHEDULE 1 LIMIT VALUES, MARGINS OF TOLERANCE, INFORMATION AND ALERT THRESHOLDS

PART I SULPHUR DIOXIDE

Alert threshold for sulphur dioxide

1.2  500 μg/m³ measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone, whichever is the smaller.