Utah Administrative Code

The Utah Administrative Code is the body of all effective administrative rules as compiled and organized by the Division of Administrative Rules (see Subsection 63G-3-102(5); see also Sections 63G-3-701 and 702).

NOTE: For a list of rules that have been made effective since January 1, 2020, please see the codification segue page.

NOTE TO RULEFILING AGENCIES: Use the RTF version for submitting rule changes.

R307. Environmental Quality, Air Quality.

Rule R307-105. General Requirements: Emergency Controls.

As in effect on January 1, 2020

Table of Contents

R307-105-1. Air Pollution Emergency Episodes.

(1) Determination of an episode and its extent or stage shall be made by the director taking into consideration the levels of pollutant concentrations contained at 40 CFR Section 51.151 and 40 CFR Section 51, Appendix L, and summarized in the table below:


                                             AIR POLLUTION EPISODE CRITERIA
                               (values in micrograms/cubic meter unless stated otherwise)

                                                   NEVER TO BE

SULFUR DIOXIDE       800      1,600       2,100        2,620
24-hour average   (0.3 ppm) (0.6 ppm)   (0.8 ppm)    (1.0 ppm)

PM10                 350        420         500          600
24-hour average

8-hour average    17,000     34,000      46,000       57,500
                 (15 ppm)   (30 ppm)    (40 ppm)     (50 ppm)
4-hour average                                        86,300
                                                     (75 ppm)
1-hour average                                       144,000
                                                    (125 ppm)

1-hour average      400        800        1,000
                 (0.2 ppm)  (0.4 ppm)   (0.5 ppm)
2-hour average                                         1,200
                                                    (0.6 ppm)

NITROGEN DIOXIDE   1130       2,260       3,000        3,750
1-hour average   (0.6 ppm)  (1.2 ppm)   (1.6 ppm)   (2.0 ppm)

NITROGEN DIOXIDE    282         565         750          938
24-hour average  (0.15 ppm) (0.3 ppm)   (0.4 ppm)   (0.5 ppm)

An air pollution alert, air pollution warning, or air pollution emergency will be declared when any one of the above pollutants reaches the specified levels at any monitoring site.

In addition to the levels listed for the above pollutants, meteorological conditions are such that pollutant concentrations can be expected to remain at the above levels for twelve (12) or more hours or increase, or in the case of ozone, the situation is likely to reoccur within the next 24-hours unless control actions are taken.

ALERT The Alert level is that concentration at which first stage control action is to begin.

WARNING The warning level indicates that air quality is continuing to degrade and that additional control actions are necessary.

EMERGENCY The emergency level indicates that air quality is continuing to degrade toward a level of significant harm to the health of persons and that the most stringent control actions are necessary.

(2) The director shall also take into consideration, to determine an episode and its extent, rate of change of concentration, meteorological forecasts, and the geographical area of the episode, including a consideration of point and area sources of emission, where applicable.

R307-105-2. Emergency Actions.

(1) If an episode is determined to exist, the Executive Director, with concurrence of the Governor shall:

(a) Make public announcements pertaining to the existence, extent and area of the episode.

(b) Require corrective measures as necessary to prevent a further deterioration of air quality.

(2) Episode termination shall be announced by the Executive Director, with concurrence of the Governor, once monitored pollutant concentration data and meteorological forecasts determine the crisis is over.


air pollution, emergency powers, governor*, air pollution

Date of Enactment or Last Substantive Amendment

September 15, 1998

Notice of Continuation

May 15, 2017

Authorizing, Implemented, or Interpreted Law


Additional Information


For questions regarding the content or application of rules under Title R307, please contact the promulgating agency (Environmental Quality, Air Quality). A list of agencies with links to their homepages is available at http://www.utah.gov/government/agencylist.html or from http://www.rules.utah.gov/contact/agencycontacts.htm.