The injuries obtained by some Trump supporters at Trump's Tucson Arizona rally, were eye injuries and seeming burns to the face. According to mainstream media, this was not a chemical agent, but was due to blinding stage lights and faulty air conditioning: https://www.dailymail.co.uk/health/article-13869171/donald-trump-rally-attendees-mystery-illnesses-2024-election.html. This is certainly wrong, since neither stage lights, nor air conditioning would produce the delayed effects that were observed, and facial burns as well. Stage lights would have affected more people, including Trump, which did not occur.
There is a good take on this by Alex Jones, using Chat GPT to analyse the available data. The computer concludes that this was a chemical attack with use of some unknown chemical agent, thus indicating that chemical warfare is now being used against American citizens, most likely by the Deep State. This was a test run of what is to come. This enters a whole new level, where conservatives are just killed: