Size Representation of PM

Particulate matter is also known as particle pollution or PM. It is a complex mixture of extremely small particles and liquid droplets. Particle pollution is made up of a number of components, including acids such as nitrates and sulfates, organic chemicals, metals, and soil or dust particles. The size of particles is directly linked to their potential for causing health problems. National Ambient Air Quality Standards address particles that are 10 micrometers in diameter or smaller because those are the particles that generally pass through the throat and nose and enter the lungs. Once inhaled, these particles can affect the heart lungs and cause serious health effects. There is one federal standard for PM10. Oklahoma is currently in attainment with that standard.

PM Filter-based Monitoring Equipment

PM10 Monitoring Sites

The division monitors PM10 at five sites using a combination of continuous and filter-based samplers. One method samples air continuously 24 hours a day, 7 days per week and reports hourly PM10 values. Other samplers pull air for 24 hours across a filter medium and are then analyzed to produce a 24-hour value that is also comparable to the standard. High values are usually the result of emissions from nearby sources exacerbated by dry windy conditions.

Data collected at the state's continuous PM10 sites may be accessed by clicking here. Data from the filter-based method are not available in real-time.

2013 PM10 Data

Primary PM10 Standard = 150 μg/m3 (24-hour)

*Not to be exceeded more than once per year on average over 3 years.

**Tulsa Peoria exceeded this standard once in 2012. This data is under review as an exceptional event. If the event is determined to be exceptional, this value will not be used to determine compliance with the standard. This site's second highest value in 2012 was 70 μg/m3.

2013 PM10 Values