Whether it’s walking the dog early, opting to stay inside all day or heading to a local pool to cool off, residents across Northwest Philadelphia coped with what was expected to be the hottest day in nearly 12 years on Tuesday. 

With a stubborn heat wave gripping the region, the National Weather Service predicted temperatures would reach 100 degrees on Tuesday, prompting city officials to declare a Heat Health Emergency through Wednesday evening.

With heat index values potentially soaring to 109 degrees, the city has activated over 150 cooling centers, including extended hours at libraries, recreation centers, and pools. The Philadelphia Water Department has also suspended utility shutoffs.

"This level of heat poses significant health risks, especially for vulnerable populations," said interim Health Commissioner Dr. Frank Franklin. "We urge residents to take precautions and utilize the cooling resources available."

The extreme conditions have triggered multiple alerts across the area. Philadelphia is under a Code Red "until further notice," focusing on assisting the unhoused population with 24-hour outreach and emergency shelter access. Montgomery County has issued its own Code Red for Tuesday and Wednesday.

Adding to the weather woes, the entire Philadelphia region – including Bucks, Chester, Delaware and Montgomery counties – is under a Code Orange Air Quality Action Day due to high ozone levels. The Pennsylvania Department of Environmental Protection warns that air pollution concentrations may be unhealthy for sensitive groups, including children, the elderly, and those with respiratory conditions.

Ozone, a gas that’s harmful when breathed in, forms from a combination of heat and different pollutants. City officials advised residents to stay indoors when possible, especially during peak heat hours. 

The city's Homeless Outreach hotline (215-232-1984) and the Philadelphia Corporation for Aging's HelpLine (215-765-9040) are available for those needing assistance or health advice.