The Environmental Improvement Board amended N.M. Admin. Code §20.2.74. Changes establish baseline dates for particulate matter, sulfur dioxide, and nitrogen dioxide, add to the definition of regulated new source pollutant, and alter the obligations of owners or operators of sources. The rule changes took effect June 3, 2011. http://www.nmcpr.state.nm.us/nmregister/xxii/xxii10/20.2.74amend.htm.