An air quality alert is being issued for all 21 New Jersey counties. This, as May's first big blast of heat and humidity arrives today. Temperatures are expected to reach 90 in Trenton and 89 in Newark and could smash records. The Department of Environmental Protection says expect air quality to approach or even exceed unhealthy levels. The best place to cool off and breathe fresh air today is the Jersey Shore. Temps in Seaside Heights and Ocean City should hover around 70.