The average adult at rest inhales and exhales about one-fourth of a cubic foot of air per minute. That totals something like 388 cubic feet of air in a day.
Along with it comes about 20 billion particles of dirt and other foreign matter (dust).
The nose traps and filters up to 70 percent of these particles that we inhale each day.
Particle Size & Quantity Matters An increase in 10 micrograms per cubic meter of indoor course particle pollution, there is a 6 % increase in the number of days of cough, wheeze, or chest tightness in asthmatic children. An increase in 10 micrograms per cubic meter of indoor fine particle pollution there is a 7 % increase in days of wheezing severe enough to limit speech. Johns Hopkins University School of Medicine February 2009
Hand Held Particle Counter Six Channels of Particle Sizes from .3 to 10 Micrometers in diameter
U.S. Public Schools in ‘Air Pollution Danger Zone’
The University of Cincinnati (UC) researchers have found that more than 30 percent of American public schools are within 400 meters, or a quarter mile, of major highways that consistently serve as main truck and traffic routes.
Research has shown that proximity to major highways—and thus environmental pollutants, such as aerosolizing diesel exhaust particles— can leave school-age children more susceptible to respiratory diseases later in life. 08/18/08
The Smokestack Effect: Toxic Air and America's Schools
What might be in the air outside your school?
The air outside 435 other schools — from Maine to California — appears to be even worse, and the threats to the health of students at those locations may be even greater. The 435 schools that ranked worst weren't confined to industrial centers. Illinois, Ohio and Pennsylvania had the highest numbers, but the worst schools extended from the East Coast to the West, in 170 cities across 34 states, USA TODAY found.
At thousands of locations, the model used by USA TODAY indicated that the air outside schools appeared far more toxic than the air in the neighborhoods where the kids lived. At 16,500 schools, the air outside appeared at least twice as toxic as the air at a typical location in the school district. 01/13/09
Air Tests Reveal Elevated Levels of Toxics Around Schools
Using the government's most up-to-date model for tracking toxic chemicals, USA TODAY spent eight months examining the impact of industrial pollution on the air outside schools across the nation.
The result: a ranking of 127,800 public, private and parochial schools based on the concentrations and health hazards of chemicals likely to be in the air outside.
The potential problems that emerged were widespread, insidious and largely unaddressed
Healthy School Building www.cdc.gov/healthyyouth/asthma/index.htm CDC Asthma Friendly School Toolkit www.asbointl.org ASBO International Environmental Resource Center www.purafil.com EnerSave IAQ Analysis www.ashrae.org ASHRAE Std 62.1-2007 and Addenda Ventilation for Acceptable Indoor Air Quality www.epa.gov/iaq/schools EPA Tools for Schools Toolkit