There have been a number of threads in which environmental issues have been brought up. There are those who have a cavalier attitude and I am sure there are many who simply aren't aware that there are laws governing whether or not or how you paint in your backyard. Instead of turning another thread into an environmental bashing, here's a list of the laws as they apply in each state along with phone numbers so you can make sure you are complying with what governs your locality:

Alabama: www.adem.state.al.us/AirDivision/AirDivisionPP.htm 334-271-7861
Alaska: www.dec.state.ak.us/air/index.htm 907-269-7634
Arizona: www.azdeq.gov/environ/air/index.html 800-234-5677
Arkansas: www.adeq.state.at.us/air/default.htm 501-682-0730
California: www.arb.ca.gov/homepage.htm 800-242-4450
Colorado: www.cdphe.state.co.us/ap/index.html 303-692-3100
Connecticut: www.dep.state.ct.us/air2/prgacti.htm 860-424-3026
Delaware: www.awm.delaware.gov 302-323-4542
Florida: www.dep.state.fl.us.air/Default.htm 850-245-2118
Georgia: www.gaepd.gov/Documents/index_air.html 888-373-5947
Hawaii: www.hawaii.gov/health/environmental/air/cab/index.html
Idaho: www.deq.state.id.us/air/prog_issues.cfm 208-373-0502
Illinois: www.epa.state.il.us/air/index.html 888-372-1996
Indiana: www.in.gov.your_environment/air_quality/index.html 317-232-8603
Iowa: www.iowadnr.com/air/index.html 515-281-5918
Kansas: www.kdheks.gov/bar 785-296-1500
Kentucky: www.air.ky.gov 502-573-3382
Louisiana: www.deq.louisiana.gov/portal/tabid/68/Default.aspx 225-219-5337
Maine: www.state.me.us/dep/air 207-287-2437
Maryland: www.mde.state.md.us 410-537-3000
Massachusetts: www.mass.gov/dep/air 617-292-5500
Michigan: www.michigan.gov/deq 800-662-9278
Minnesota: www.pca.state.mn.us/air/index.html 651-296-6300
Mississippi: www.deq.state.ms.us/MDEQ.nsf/page/Air_Homepage
Missouri: www.dnr.mo.gov/env/apcp/index.html 573-751-4817
Montana: www.deq.state.mt.us/AirQuality/AQinfo.asp 406-444-2929
Nebraska: www.deq.state.ne.us 402-471-2186
Nevada: http://ndep.nv.gov/bapc/index.htm 775-687-9350
New Hampshire: www.des.state.nh.us/ard_intro.htm 603-271-1370
New Jersey: www.state.nj.us/dep/airmon 609-292-0138
New Mexico: www.nmenv.state.nm.us/aqb/index.html 505-827-1494
New York: www.dec.state.ny.us/website/dar/index.html
North Carolina: http://daq.state.nc.us 919-733-3340
North Dakota: www.ehs.health.state.nd.us/AQ 701-328-5188
Ohio: http://web.epa.state.oh.us/dapc 614-644-2270
Oklahoma: www.deq.state.ok.us/AQDnew/index.htm 405-702-4100
Oregon: www.oregon.gov/DEQ/AQ 503-229-5696
Pennsylvania: www.dep.state.pa.us/dep/deputate/airwaste/aq/default.htm 717-787-9702
Rhode Island: www.dem.ri.gov/programs/benviron/air/index.htm 401-222-2808
South Carolina: www.scdhec.net/environment/baq 803-898-4123
South Dakota: www.state.sd.us/denr/DES/AirQuality/airprogr.htm 605-773-3151
Tennessee: www.state.tn.us/environment/apc 615-532-0554
Texas: www.tceq.tx.us/nav/eq/eq_air.html 512-239-1000
Utah: www.airquality.utah.gov 801-536-4022
Vermont: www.anr.state.vt.us/air 802-241-3840
Virginia: www.deq.state.va.us/air 804-698-4000
Washington: www.ecy.wa.gov/programs/air/airhome.html
West Virginia: www.wvdep.org/item.cfm?ssid=8 304-926-0475
Wisconsin: www.dnr.state.wi.us/org/aw/air 608-266-2621
Wyoming: http://deq.state.wy.us/aqd/index.asp?pageid=8 307-777-7391