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Based on exceedances of the ozone National Ambient Air Quality Standards (NAAQS); large portions of North California, Idaho, Montana, Wyoming, and New Mexico would not have had any ozone exceedance days between 1997-2016 were there no wildfires.

New data from Dr. Yun Hang, MS, PhD and Yang Liu, PhD at Emory University Rollins School of Public Health who also produced the Lancet Countdown Indicator 1.2.1.

A measure that combines effects of air temperature and humidity.

Lancet Countdown Indicator 1.1.2. The “days of heatwave exposure” are measured as “person-days.” This unit encompasses both the number of people exposed and the length of exposure. One person-day represents one person being exposed to one day of a heatwave. In this way, if 10 people were each exposed to 10 days of a heatwave, there would be a total of 100 person-days of heatwave exposure in this population.

Utilizes updated methodology and is not directly comparable to previous data reported for this indicator in past U.S. Briefs (see 2021 global Lancet Countdown Appendix for more details).

Throughout this Brief, bolded data designates previously unpublished data. In addition, the use of an asterisk (*) denotes newly published data for the U.S. from Romanello et al (2021), and the most recent year of data available is presented. Please see the 2021 global Lancet Countdown report and Appendix for further details about these specific indicators.

Young S, Mallory B, McCarthy G. The path to achieving Justice40. The White House. 2021; published online July 20. https://www.whitehouse.gov/omb/briefing-room/2021/07/20/the-path-to-achieving-justice40/ (accessed Sept 8, 2021).

The United States of America nationally determined contribution: reducing greenhouse gases in the United States: a 2030 Emissions Target. 2021; published online April 21.

Fact sheet: President Biden sets 2030 greenhouse gas pollution reduction target aimed at creating good-paying union jobs and securing U.S. leadership on clean energy technologies. The White House. 2021; published online April 22. https://www.whitehouse.gov/briefing-room/statements-releases/2021/04/22/fact-sheet-president-biden-sets-2030-greenhouse-gas-pollution-reduction-target-aimed-at-creating-good-paying-union-jobs-and-securing-u-s-leadership-on-clean-energy-technologies/ (accessed Sept 8, 2021).

Peters DR, Schnell JL, Kinney PL, Naik V, Horton DE. Public health and climate benefits and trade-offs of U.S. vehicle electrification. GeoHealth 2020; 4: 2020GH000275.