The US treats its workers worse than every other industrialized country by a lot. We're the only industrialized country that does not guarantee even a single paid day off. Many developing nations even provide for this. The corporate elite want Americans to work until they're sick and dead. 

Additionally, the majority of OSHA's airborne exposure limits are woefully outdated and in some cases, over 100 times higher than what is recommended based on current toxicology reports. But it takes an act of congress to change them and they will side with companies every time over the worker. 

How we treat workers in the US is appalling. If politicians had to breathe the contaminants at just under the exposure limits, they'd lower them right away. But they don't have to - so they don't care about anything except which company or rich person will donate money to their campaign.