DEER PARK, Texas — A chemical leak involving hydrogen sulfide occurred at the Pemex Oil Refinery in Deer Park on October 10, 2024, prompting a shelter-in-place order. The order was issued at 7 p.m. and lifted at 9:30 p.m. after air monitoring reports indicated no hazardous pollutants in the community, according to a press release from the City of Deer Park.