Air pollution alert

Air pollution Alerts are issued here when any of the following thresholds in Directive 2008/50/EC are exceeded:

• Ozone Information 180 µg/m3 for 1 hour
• Ozone Alert 240 µg/m3 for 1 hour
• Sulphur Dioxide Alert 500 µg/m3 for 3 consecutive hours over 100km2 area
• Nitrogen Dioxide Alert 400 µg/m3 for 3 consecutive hours over 100km2 area

Alerts will be displayed for a 24 hour period after they have been exceeded.