1995 Ambient Air Quality data was modified based on the 2002 Aerial Photography for more accurate station location. Some sites were discontinued due to certain criteria, such as management decisions and/or certain construction issues. Some sites were added due to the expansion of the network.
Ambient Air Quality data was modified based on the 2012 Aerial Photography for more accurate station location. Some sites were discontinued due to certain criteria, such as management decisions and/or certain construction issues. Some sites were added due to the expansion of the network. Attributes were added in 2015.