Five things you need to know for Wednesday

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Here's what you need to know to get your Wednesday started.

1. A formal investigation into Tuesday's chemical explosion at the General Motors Stamping Plant in Marion begins at 7 a.m. today. The incident killed one worker, 48-year-old Jim Gibson, and injured eight others. Emergency crews say the explosion and subsequent chemical spill involved chlorine dioxide, which can be dangerous to the skin or if inhaled.  However, GM says they received some conflicting reports as to what other chemicals may have been involved in the explosion.

2. This morning might be a good time to fill up your gas tank. Prices at the pump are expected to surge ahead of the Fourth of July weekend. It's all about supply and demand. AAA says a record number of people are expected to hit the road, and that will cost everyone, says Michael Green with AAA. Find the cheapest gas prices around metro Indianapolis here.

3. The Fourth of July is all about fun, but it comes with a word of caution for parents. Those sparklers burn between 1,200 and 1,800 degrees. To put that in perspective, glass can melt at 900 degrees. Sparklers and bottle rockets are responsible for up to 40 percent of all fireworks injuries. Safety experts say to avoid giving sparklers to young children. Also, keep a water source or fire extinguisher nearby when igniting anything. See more tips here.

4. Chuck Lofton tells us the good weather arrives today. As you head out the door, you'll notice temperatures a little cooler and the humidity slowly dropping during the day. Even cooler air hits Thursday morning when lows dip in the 50's. You'll be able to open the windows and turn off the A/C for a few days. This is perfect timing for the Fourth of July which still looks picture perfect. Make plans to spend the Fourth outside with friends and family! Sunny and 70's Friday with a repeat performance Saturday. See Fourth of July events for central Indiana here.

5. Authorities say at least 11 people were injured after a propane tank on a food truck exploded in north Philadelphia, and two remain in critical condition with serious burns. Surveillance video of the explosion shows a huge fireball that reaches to the other side of the street.