Houston Health Department

Outdoor Air Quality — Asthma Alerts

Asthma Air Aware Day Warnings

The Houston Health Department issues an Asthma Air Aware Day Warning when outdoor air conditions are similar to days when Houstonians historically experience a high number of asthma problems. Houstonians with asthma should be mindful of the potential risk on Asthma Air Aware Days.

There is NOT an active Asthma Air Aware Day Warning.

(Warnings are posted here on weekday mornings when issued.)

Receive Asthma Air Aware Day Warnings via email, text and/or voice call by registering for AlertHouston.

Air Quality Index (AQI)

Every day the Air Quality Index (AQI) from EPA/AirNow tells you how clean or polluted your outdoor air is, along with associated health effects that may be of concern. AQI translates air quality data into numbers and colors that help people understand when to take action to protect their health.

get current air quality index

Air Quality Forecast and Ozone Action Day Alerts

Sign up to receive Today's Texas Air Quality Forecast and Ozone Action Day e-mail alerts from the Texas Commission on Environmental Quality. 

sign up to for ozone action day email alerts


Air quality affects how you live and breathe. Like the weather, it can change from day to day, or even hour to hour. Up-to-date information allows you to make decisions based on air quality forecasts. EnviroFlash comes to you through a partnership between the US EPA and your state or local air quality agency - notifying you about air quality so you don't have to go searching for it!

get air quality forecasts

Houston Clean Air Network

The extreme Texas heat often keeps Houstonians from heading to the park or taking an afternoon jog. Sometimes, however, they're dissuaded from outdoor activities due to poor air quality. Now, residents of the greater Houston area can track ozone levels through the Houston Clean Air Network.

Learn More about Houston Clean Air Network


The information contained herein is for educational and informational purposes only. The Houston Health Department cannot provide any legal or medical advice. Please consult an attorney or a medical practitioner regarding specific legal or medical related questions and seek medical attention if you become ill or injured.