Introduction

The purpose of 310 CMR 8.00 is to prevent ambient aircontaminantconcentrationsatanylocation in the Commonwealth from reaching levels which would constitute significant harm, or imminent and substantial endangerment to the health of persons. The levels which would constitute significant harm, or imminent and substantial endangerment, to the health of persons as have been defined by the Administrator of the Environmental Protection Agency are set forth in Table 1. TABLE 1. CONTAMINANT CONCENTRATION LEVELS Prescribed by the EPA Administrator as would cause significant harm, or Imminent and Substantial Endangerment, to Health. W444444444444444444444444444444444444444444444444444444444444444 4444444U Ambient Air Contaminant Concentration Levels Contaminant Ave. ug/m 3 ppm COHs Duration Product (average) S))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) )))))))Q Sulfur Dioxide (SO ) Particulate Matter PM10 Tape Stain (COHs) Product of: (SO ) X (COHs) (SO ) (COHs) Carbon Monoxide Carbon Monoxide Carbon Monoxide Photochemical Oxidant 0.6* Nitrogen Dioxide Nitrogen Dioxide *expressed as Ozone (O )