Another quiet ozone season thanks to cool mid-summer temperatures

Ozone Season 2014

By Doug Norsby, Air Quality Planner III

Again this year, a wet spring followed by mild summer weather provided a welcome relief from the high ozone levels seen during 2011 and 2012. The 2014 ozone season began with normal temperatures and rainfall in April and May, followed by above-average rainfall in early June and below-average temperatures in July, resulting in a relatively good ozone season. MARC issued 46 yellow SkyCasts and two orange Ozone Alerts for the Kansas City region’s air quality maintenance area. The low number of yellow and orange SkyCasts was almost identical to last year’s numbers.

The SkyCast is issued daily during ozone season (April 1–Oct. 31) and corresponds with the Air Quality Index (AQI), a public information tool that associates colors and health messages with ranges of air pollutant concentrations. This season, only two days exceeded the standard set by the U.S. Environmental Protection Agency to protect public health.

At the conclusion of the 2014 season, ozone monitor readings appear to show that the Kansas City region is no longer violating the ozone standard for the first time since 2010. However, federal law requires EPA to periodically review air quality standards to ensure that they provide adequate health and environmental protection, and to update those standards as necessary. EPA is currently in the process of reviewing the ozone standard and is expected to propose a new standard in December. If it is tightened, it is likely that the recent lower readings will still fall in the range that is considered to be unhealthy.

The region continues to employ voluntary strategies to reduce ozone-forming and greenhouse gas emissions, and our participation in the EPA’s Ozone Advance program and implementation of our award-winning Clean Air Action Plan (CAAP) both leverage local community actions to reduce potential federally mandated and state-imposed regulations.

For more information, contact the MARC Air Quality program.

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