big yikes

Houston lands on the wrong end of national pollution report

Houston ranks as the 15th most polluted city in the U.S. No other Texas city appears in the ranking. Photo via Getty Images

Houston just made a list that no one wants it to be on.

Data compiled by the National Public Utilities Council ranks Houston as the 15th most polluted city in the U.S. No other Texas city appears in the ranking. Three California cities — Bakersfield, Visalia, and Fresno — took the top three spots.

The ranking considers a city’s average volume of fine particulate matter in the air per year. Fine particulate matter (formally known as PM2.5) includes soot, soil dust, and sulphates.

The council based its ranking on the average annual concentration of PM2.5 as measured in micrograms per cubic meter of air, known as µg/m3. The ranking lists Houston’s average annual µg/m3 as 11.4. The World Health Organization (WHO) recommends a top µg/m3 of 5, while the American Lung Association sets 9 µg/m as an average annual guideline.

A report released in 2024 by Smart Survey found that the Houston area had just 38 days of good air quality the previous year.

“Most of Houston’s air pollution comes from industrial sources and diesel engines, although sources as diverse as school buses and meat cooking also contribute to … the problem,” the nonprofit Air Alliance Houston says.

The U.S. Environmental Protection Agency says PM2.5 poses “the greatest risk to health” of any particulate matter. Among other health issues, fine particulate matter contributes to cardiovascular disease, lung cancer, and chronic pulmonary disease.

Among the sources of PM2.5 are wildfires, wood-burning stoves, and coal-fired plants, according to the American Lung Association.

The WHO says air pollution causes 7 million deaths annually and may cost the global economy $18 trillion to 25 trillion by 2060. With 70 percent of the population expected to live in urban centers by mid-century, cities are at the forefront of efforts to reduce pollution, according to National Public Utilities Council.

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A View From HETI

Greentown Labs announced it's receiving a percentage of Prithvi Ventures' proceeds. Photo courtesy of Greentown Labs

Effective immediately, Greentown Labs, which has locations in Houston and Somerville, Massachusetts, is benefitting from funds raised by an investment group.

Greentown Labs, a nonprofit climatetech incubator, announced its partnership with New York-based Prithvi Ventures, a firm that specializes in early-stage climatetech. The unique partnership includes Prithvi Ventures donating "a percentage of proceeds received from its Fund 1 and Fund 2 to Greentown on a quarterly basis, in perpetuity," per Greentown's news release. The exact percentage was not disclosed.

“There’s an understanding in sports that the best teams always take responsibility and accountability for their own and look out for each other—that the members of the team are a reflection of the franchise,” says Kunal Sethi, founder and general partner at Prithvi Ventures. “I have always believed the same to be true in venture, too.

"Founders should know their supporters, team, and cap tables inside and out. It matters who you surround yourself with and Greentown Labs is always the first name that comes up for me," he continues. "Every founder in climatetech should work with them or they’re missing out on so much.”

Prithvi Ventures already has a handful Greentown member companies in its investment portfolio, including Carbon Upcycling, Mars Materials, Nth Cycle, and Rheom Materials. The firm has invested in 30 companies total, and aims to lead rounds, preferring to be the first large check for the startups it invests in.

“We are delighted to deepen our relationship with Prithvi Ventures and are grateful for their ongoing support,” Aisling Carlson, senior vice president of partnerships at Greentown Labs, says in the statement. “Through this new partnership, Prithvi Ventures and its limited partners are setting an example for how the venture community can more directly support the incubators and accelerators working to catalyze climatetech innovation and entrepreneurship.”

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