In NY State Dept of Environmental Conservation website: http://search.dec.state.ny.us/, you can do searches like: +acetone +concentration (22 hits). The results seem to get mostly allowable concentrations in wastewater (.28mg/l) and non wastewater (160 mg/kg).

The search: +acetone +cleaning gets 23 hits, including the DEC "Rules and Regulations" Part 200 "General Provisions" at: http://www.dec.state.ny.us/website/regs/part200a.html. Near the bottom of this part is section "(cg) Volatile organic compound (VOC). Any organic compound which participates in atmospheric photochemical reactions". Acetone is one of the compounds listed. It may take quite a bit of digging through these pages and searches, to get mention of potential harm to people in the vicinity of acetone cleaning projects.

New York City has an advanced search link from: http://search.nyc.gov/query.html. The search "must contain in the full text": acetone concentration gets 15 hits, some of which may be close to what you are after. Use CTRL-F (find in page) to navigate to where these long documents are mentioning acetone or dimethyl ketone.

You can also try searching: acetone and concentration in the OSHA full search page at: http://www.osha.gov/pls/oshaweb/owasrch.full_site_search (193 hits in OSHA web site, 12 hits in Regulations Standards - 29 CFR).

Also, in the National Library of Medicine site at: http://www.nlm.nih.gov/, try searching just the word: acetone (this search gets a total of about 20 hits in that site)

Hope this helps...