# Mich. Admin. Code R. 336.2803 - Ambient air increments

Rule 1803. In areas designated as class I, II, or III, increases in pollutant concentration over the baseline concentration shall be limited to all of the following:

**Table 182**

Ambient Air Increments

Pollutant | Maximum Allowable Increase (micrograms per cubic meter) |

CLASS I | |

Particulate matter: | |

PM-10, annual arithmetic mean | 4 |

PM-10, 24-hour maximum | 8 |

PM 2.5, annual arithmetic mean | 1 |

PM 2.5, 24-hour maximum | 2 |

Sulfur dioxide: | |

Annual arithmetic mean | 2 |

24-hour maximum | 5 |

3-hour maximum | 25 |

Nitrogen dioxide: | |

Annual arithmetic mean | 2.5 |

CLASS I | |

CLASS II | |

Particulate matter: | |

PM-10, annual arithmetic mean | 17 |

PM-10, 24-hour maximum | 30 |

PM 2.5, annual arithmetic mean | 4 |

PM 2.5, 24-hour maximum | 9 |

Sulfur dioxide: | |

Annual arithmetic mean | 20 |

24-hour maximum | 91 |

3-hour maximum | 512 |

Nitrogen dioxide: | |

Annual arithmetic mean | 25 |

CLASS III | |

Particulate matter: | |

PM-10, annual arithmetic mean | 34 |

PM-10, 24-hour maximum | 60 |

PM 2.5, annual arithmetic mean | 8 |

PM 2.5, 24-hour maximum | 18 |

Sulfur dioxide: | |

Annual arithmetic mean | 40 |

24-hour maximum | 182 |

3-hour maximum | 700 |

Nitrogen dioxide: | |

Annual arithmetic mean | 50 |

For any period other than an annual period, the applicable maximum allowable increase may be exceeded during 1 period per year at any 1 location.

## Notes

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