Azaan Khan died after his bicycle was hit by a car as he crossed the A45 Coventry Road in Yardley, Birmingham, on the evening of 8 June last year.
Jon Darke, from Palmerston, Barry, about a mile-and-a-half from the plant, said: "They usually test the alarms every Monday afternoon at 3pm, so we're used to hearing that."But when you hear it on Saturday, it means there’s something going on."
It could, the 69-year-old said, be heard for miles."It’s a bit worrying. All the fumes and smoke were heading to Sully due to the wind."Silicone has been produced at the site, previously called Dow Corning, since 1952. About 630 people work there.
A Dow spokeswoman said it had experienced a chemical release.She added: "The cause of the release was quickly identified and contained and at 16:50 BST the all-clear signal was given and shared with the community.
"There have been no resulting injuries on the site nor any reported in the community."
The company will be investigating the cause of the release and identifying measures to prevent this type of incident reoccurring in the future.She added: "We're losing doctors faster than we're recruiting them to become medical students and you can't help think this has something to do with that."
Dr Williams added: said "I think you'd find it hard to find a female doctor - and it does happen to males as well - that has not had some experiences over their lifetime career."If I thought medical students today couldn't take the careers of their choice because of misogyny, that is heartbreakingly bad."
Both doctors want to see better reporting mechanisms so staff can feel confident about coming forward with complaints.The Welsh government and NHS said in a statement: "We encourage the NHS to support criminal proceedings against anyone who assaults staff, visitors or patients.