Table 1.

CO₂-USA urban greenhouse gas monitoring networks.

City	# of sites	Species	City GHG emission reduction target	Project website
Boston30,31	8	CO2, CH4, CO	50%2005 by 2030 & net zero by 205055	http://atmos.seas.harvard.edu/lab/index.html
Indianapolis17,18,32–34	14	CO2, CH4, CO	Net zero by 205056	http://sites.psu.edu/influx/
Los Angeles35	12	CO2, CH4	50%1990 by 2025, 73%1990 by 2035, & net zero by 205057	https://megacities.jpl.nasa.gov/
Washington D.C./Baltimore46	13	CO2, CH4	Baltimore: 15%2010 by 202058	https://www.nist.gov/topics/northeast-corridor-urban-test-bed
			D.C.: 50%2006 by 2032 & 80%2006 by 205059
Portland36	3	CO2	50%1990 by 2030 & net zero by 205060	http://web.pdx.edu/~arice/CO2_PDX.html
Salt Lake City37–41	7	CO2, CH4	50%2009 by 2030 & 80%2009 by 204061	https://air.utah.edu/
San Francisco (BAAQMD*)42	4	CO2, CH4, CO	Net zero by 205062	https://www.baaqmd.gov/about-air-quality/air-quality-measurement/ghg-measurement
San Francisco (BEACO2N†)43	65	CO2	Net zero by 205062	http://www.beacon.berkeley.edu/
Toronto44,45	4	CO2, CH4, CO	30%1990 by 2020, 65%1990 by 2030, & net zero by 205063	https://www.canada.ca/en/environment-climate-change/services/climate-change/greenhouse-gases-aerosols-monitoring.html

The emissions baseline year is listed in subscript for the city GHG emission reduction targets.

*BAAQMD: Bay Area Air Quality Management District. ^†BEACO₂N: Berkeley Environmental Air-quality & CO₂ Network.