On Tuesday, service workers rallied at major airports in Charlotte, North Carolina, and Phoenix. They called for immediate action from employers to ensure their safety in the workplace, including adequate breaks and access to drinking water during periods of extreme heat.

In Phoenix, where earlier this year local officials enacted a heat ordinance mandating many of these protections, workers and legislators sounded the alarm that the ordinance has led to inadequate improvements, and questioned how the protections are being enforced. “Why is it after passing an ordinance we’re still asking for the basics? Water. Breaks. These are humans rights,” said City of Phoenix Councilwoman Betty Guardado at the rally. Later this week, laborers across the country will be taking a coordinated water break to signify the need for access to drinking water at work.

As human-caused climate change continues to make the planet hotter, extreme heat in the workplace is increasingly becoming a lethal threat. Organizers say “Heat Week” is also spurred by the recent sudden deaths of Wednesday “Wendy” Johnson, a postal worker in North Carolina, and Ronald Silver II, a sanitation worker in Maryland. Both Johnson and Silver are believed to have died, in part, because of on-the-job heat exposure, which kills dozens of workers every year.