INQUIRER: The summer’s first heat wave has started, if the forecast is correct, and with it comes an air quality alert for parts of the region. Three straight days of 90 degrees or more qualifies as a heat wave, and the area is predicted to get at least five. Yesterday, the high was 91. Today and tomorrow could hit the mid-90s, followed by highs in the low 90s Wednesday and Thursday. Friday could extend the streak, if it nudges past the expected 88. MORE