Environmental health hazards Resources to help deal with environmental health hazards. Air quality Resources you can use to find current air quality information for Philadelphia. Code Blue Actions the City takes when it declares a Code Blue to keep people who are homeless safe from extreme cold. Find a cooling center Where to find public cooling centers during times of extreme heat and humidity in Philadelphia. Lead exposure Information for Philadelphians about lead safety. Zika virus Information about Zika in Philadelphia, and how the City is working to prevent the emergence and spread of the disease.