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#CodeYellow #AirPollution advisory for Monday-Wednesday in parts of London and then Wales and South West England. Probably PM2.5 but could include ozone. @BWallaceMP @DefenceHQ should warn military on endurance exercises cc @H_S_E uk-air.defra.gov.uk 
#CodeYellow | Widespread MODERATE ozone and particle #AirPollution episode underway by Tuesday. Worsening sharply Wednesday and Thursday as winds turn easterly (bringing our fumes back to us with more from others). Check health advice and warn military on exercises cc @BWallaceMP
#CodeOrange alert | MODERATE ozone #AirPollution from Monday in London and building across much of southern UK by Wednesday. Possible #CodeRed in places by Friday. Nasty episode could continue until Sunday uk-air.defra.gov.uk
