Table 2

Air quality alert levels (one hour averages) for PM10 on Montserrat

PM10 (μg/m3)DescriptionAction
<50Ash levels lowNone
51–100Ash levels raisedThose who have experienced effects on health during past dusty episodes, especially asthmatics, should ensure they have masks available
101–300Ash levels very highMasks should be worn
>300Ash levels alertMasks should be worn and efforts made to reduce exposure