Surface Ozone (O3), also called Troposheric Ozone, is a critical atmospheric species that drives much of tropospheric photochemistry. It regulates the oxidation capacity of the troposphere, influencing background levels of trace chemicals. Ozone is also a strong greenhouse gas, and is the third most important contributor to greenhouse radiative forcing behind CO2 and CH4.

Ozone is produced in the troposphere by photochemical oxidation of CO, CH4 and non-methane volatile organic carbons (NMVOCs) in the presence of NOx. Stratosphere-troposphere exchange is another source of ozone to the troposphere. Loss of tropospheric ozone takes place through chemical reactions and dry deposition. Ozone is a key trace gas for both the chemistry and radiative balance of the troposphere, and is the principal pollutant associated with photochemical smog.

The ESRL Global Monitoring Division has been measuring surface ozone at several global locations starting at Barrow, Alaska and Mauna Loa, Hawaii in 1973. The map and table below show the locations of surface ozone measurements.

Locations of surface ozone (O3) measurements.
Code Name Country Latitude Longitude Elevation (Meters) Data Plots
ARH Arrival Heights, Antarctica New Zealand -77.833 166.200 250 Data Plots
*BAO Boulder Atmospheric Observatory, Colorado United States 40.050 -105.004 1584 Data Plots
Status plots
BMW Tudor Hill, Bermuda United Kingdom 32.270 -64.880 30 Data Plots
BRW Barrow, Alaska United States 71.323 -156.611 11 Data Plots
Status plots
EUR Eureka, Nunavut Canada 79.9830 -85.9500 0
ICE Storhofdi, Vestmannaeyjar Iceland 63.400 -20.288 118 Data Plots
LDR Lauder New Zealand -45.040 169.680 370 Data Plots
MLO Mauna Loa, Hawaii United States 19.536 -155.576 3397 Data Plots
NWR Niwot Ridge, Colorado United States 40.0362 -105.544 3035 Data Plots
Status plots from forest (C-1) site
PCO Pico, Azores Portugal 38.470 -28.400 2225 Data Plots
RPB Ragged Point Barbados 13.170 -59.430 45 Data Plots
SMO Tutuila American Samoa -14.247 -170.564 42 Data Plots
Status plots
SPO South Pole, Antarctica United States -89.980 -24.800 2810 Data Plots
SUM Summit Greenland 72.580 -38.480 3238 Data Plots
Status plots
TBL Table Mountain, Colorado United States 40.1250 -105.2368 1689 Status plots
THD Trinidad Head, California United States 41.054 -124.151 107 Data Plots
Status plots
TIK Hydrometeorological Observatory of Tiksi Russia 71.597 128.889 31 Data Plots
TUN Tundra Lab, Niwot Ridge, Colorado United States 40.0542 -105.5889 3538 Status plots from tundra site
*WKT Moody, Texas United States 31.315 -97.327 251 Data Plots
WVR Weaverville, California United States 40.731 -122.942 613 Data Plots
*- Discontinued site

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