In the greater Houston area, ozone season lasts from March to November. In 2018, we’ve already had 12 ozone action days. According to the Texas Commission on Environmental Quality, ozone action days are designated on warm, sunny days that are favorable to the formation of ozone, a compound that forms at near the ground in the atmosphere through complex reactions between nitrogen oxides and volatile organic compounds. While a lot of people think bad air quality occurs only in areas near the industry along the Houston Ship Channel, on some days readings at the ozone monitor near the Woodlands can be higher than at monitors along the Ship Channel. Public Citizen, along with Corey Williams from Air Alliance Houston, and a small group of Woodlands residents sat down with UH Professor Jimmy Flynn to learn more.
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The Jones State Forest Air Monitor
University of Houston operates the Jones State Forest Air Monitor. The monitor is not part of TCEQ’s network of regulatory air monitors. It collects data on ozone, carbon monoxide, and meteorology. The monitor is attached to a tower and collects readings above the tree tops to help ensure that it is measuring ambient air quality.
Stagnant Air = Bad Ozone
Ozone is a harmful byproduct of a reaction between nitrogen oxides (NOx) and volatile organic compounds (VOCs). NOx and VOCs are emitted from transportation, industrial processes, and some natural processes. Ozone can cause serious problems especially for people who are already vulnerable, like children, the elderly, and people with pre-existing conditions.
One of the biggest risk factors for ozone formation, according to Dr. Flynn, is stagnant air. Stagnant air occurs when an air mass remains over a region for an extended period of time. There are no heavy breezes or precipitation to clear pollutants out of the atmosphere. Dr. Flynn also mentioned that for ozone in particular, rainfall events will not do much to clear ozone out of the air due to its lack of solubility. Ozone needs air movement to clear it out.
Do you know what to do on an ozone action day?
Learn how to protect yourself and your family when ozone action days occur. You can sign up for alerts through the TCEQ here. Dr. Flynn told us that staying inside on high ozone days is a great way to protect your health because ozone concentrations tend to be much lower inside. Stay safe!
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