The Houston Problem is a term used to describe the air pollution crisis in Houston, Texas. The main pollutant is SMOG, which is a combination of smoke and fog. SMOG is caused by the burning of fossil fuels such as coal and oil, and is a major contributor to global warming. The Houston Problem has been an ongoing issue since the 1970s, and has been linked to numerous health issues such as asthma, heart disease, and lung cancer.