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並前往https://www.dep.pa.gov/Business/Air/BAQ/AdvisoryGroups/SmallBusiness/Documents/4-8-2015_SmallBusinessMeeting_Apr22_WhatIsAirQuality.pdf?Mobile=1&Source=%2FBusiness%2FAir%2FBAQ%2FAdvisoryGroups%2FSmallBusiness%2F_layouts%2Fmobile%2Fview.aspx%3FList%3D0336ea29-a8c4-4461-8019-3c0247276367%26View%3D7f7957b2-9c9f-48d6-b1fd-0ae9ca3aa5a5%26CurrentPage%3D1

The Importance of Air Quality in PA

15 micrograms per cubic meter (µg/m3) to 12 µg/m3. • The 24-hour PM. 2.5 standard was retained (35 µg/m3).

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