an official New Hampshire government website
New Hampshire Department of Environmental Services
Air Quality Current Data
Saturday, June 25, 2016

The table below shows current air quality concentrations at New Hampshire's air monitoring sites for two air pollutants: ground-level ozone and particle pollution (fine particles).  Full monitoring, reporting, and forecasting for ozone occurs from April through September; monitoring and reporting of fine particles occurs year-round. The information in the table is updated every hour and includes wind speed, wind direction, and outside temperatures (if data are available). A map of monitoring site locations is shown at the right.

The Appalachian Mountain Club (AMC) maintains three monitors in northern New Hampshire, and the Hubbard Brook Research Foundation (HBRF) maintains one station in cooperation with the EPA. The data from HBRF may be downloaded from CASTNET.

The table and map are color coded according to EPA's Air Quality Index, which relates air pollutant concentrations to health effects and recommended actions.

Health Guide and Recommended Actions

Map of Current Air Quality
(Ozone and Fine Particles)
map
Range for Ozone: 0 to less than 60 parts per billion. Range for Fine Particles: 0 to less than 15.5 micrograms per cubic meter. Range for Ozone: 60 to less than 76 parts per billion. Range for Fine Particles: 15.5 to less than 35.5 micrograms per cubic meter. Range for Ozone: 76 to less than 96 parts per billion. Range for Fine Particles: 35.5 to less than 55.5 micrograms per cubic meter. Range for Ozone: 96 to  less than 116 parts per billion. Range for Particles: 55.5 to less than 140.5 micrograms per cubic meter.


Relative Pollutant Levels Chart Comparison map


Ozone and Fine Particles Real-Time Monitoring Data
Placing your cursor over the table cell displays the health message; Clicking on
the table cell displays a graph of pollutant levels over the previous 48 hours.

Site Location

8-hour
Ozone
(ppb)

24-hour
Fine
Particles
(ug/m3)

Wind Speed
and Direction

Temp.

Concord - DES

12

 

W @ 2 mph

68o F

Keene - DES

12

4

ESE @ 1 mph

67o F

Laconia - DES

19

     
Lebanon Airport - DES

8

6

Calm

63o F

Londonderry - DES

15

4

SE @ 3 mph

72o F

Mount Washington Base - DES/AMC

12

     
Nashua - DES

7

     
Portsmouth (Pierce Island) - DES

8

6

Calm

69o F

Seacoast (Odiorne State Park, Rye) - DES

15

     
 

High Elevation Site Location

8-hour
Ozone
(ppb)

24-hour
Fine
Particles
(ug/m3)

Wind Speed
and Direction

Temp.

Miller State Park (Southern Mountains) - DES

46

5

S @ 3 mph

67o F

Mount Washington Summit
  (Northern Mountains) - DES/AMC

38

     


Sulfur Dioxide Real-Time Monitoring Data

Site Location

1-hour
Sulfur Dioxide
(ppb)

Barometric
Pressure

Wind Speed
and Direction

Temp.

Concord - DES 1  

W @ 2 mph

68o F

Londonderry - DES 1 756.6 mmHg

SE @ 3 mph

72o F

Miller State Park (Southern Mountains) - DES 0 705.2 mmHg

S @ 3 mph

67o F

Pembroke- DES 0  

N @ 1 mph

68o F

Portsmouth (Pierce Island) - DES 1  

Calm

69o F

NOTES:   1.   Ozone values are based on eight-hour running averages;  Fine Particle values are based on twenty four-hour running averages.   If a complete-period average cannot be calculated, due to absence of data, the average is displayed within square brackets (e.g., [ 31 ])
2.   Data in the table are based on real-time hourly averages for the time period ending:  8 am 6/25/2016 EST.   All real-time values are unofficial pending full quality assurance/quality control evaluation.
3.   Sulfur Dioxide (SO2), Barometric Pressure, Wind Speed, Wind Direction, and Temperature values are based on the latest one-hour average.
4.   N/D indicates that the Site is enabled but the latest-period data are temporarily unavailable.
5.   N/R indicates that the Site is currently disabled.
6.   Grayed-out cells indicate that the parameter is not collected at the Site.
7.   Seasonal indicates that Ozone monitoring occurs from April through September at the site.

Ground-level Ozone
Ground-level ozone, more commonly called smog, is measured in parts per billion (ppb). The federal health based standard for an 8-hour concentration is set at 70 ppb. Since ozone is a summertime pollutant, wintertime monitoring is limited and no wintertime forecast is provided. Full monitoring, reporting, and forecasting for ozone occurs from April through September.

The EPA established a tighter 8-hour ozone standard in October of 2015 to better protect public health. The 8-hour standard was lowered from 0.075 ppm to 0.070 ppm. For more information, please visit http://www3.epa.gov/ttn/naaqs/standards/ozone/s_o3_index.html.

Fine Particles
Fine particle pollution consists of both solid and liquid particles that are less than 2.5 microns in diameter (a micron is a millionth of a meter). Particle concentrations are measured in micrograms per cubic meter (ug/m3). The federal health based standard for a 24-hour concentration is set at 35 ug/m3. Monitoring and reporting of fine particles occurs year-round.

The EPA has established tighter fine particle standards to better protect public health. In 2006 the standard was lowered from 65 ug/m3 to 35 ug/m3. In 2012 the annual standard was lowered from 15.0 ug/m3 to 12 ug/m3. For more information, please visit http://www3.epa.gov/ttn/naaqs/standards/pm/s_pm_index.html.

Sulfur Dioxide
Sulfur dioxide (SO2) is a highly reactive gas which primarily comes from fossil fuel combustion at power plants and other industrial facilities. Sulfur dioxide concentrations are measured in parts per billion (ppb). The federal health based standard for 1-hour concentrations is set at 75 ppb. Monitoring and reporting of sulfur dioxide occurs year round.

EPA first set standards for sulfur dioxide in 1971. In June 2010 EPA established a 1-hour SO2 standard at 75 ppb to better protect public health. For more information, please visit www.epa.gov/airquality/sulfurdioxide.

Related Topics


NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm
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