Night blight and dark skies – new maps launched

The most detailed ever satellite maps of England’s light pollution and dark skies, released today (13th June) by the Campaign to Protect Rural England (CPRE), have shown that Thanet Earth is the second worst light polluter in the country, only second to Tata Steel in Rotherham. [1].

Night sky over Thanet, photo by Kimberley Eve

Night sky over Thanet, photo by Kimberley Eve

Overall, Kent is the 29th darkest county of 41. The maps, produced using satellite images captured at 1.30 am throughout September 2015, show that within Kent, Ashford has the darkest skies, 68th of 326 districts. Ashford Borough Council adopted a specific Dark Skies Policy in 2014 to raise awareness about ways we can minimise light pollution and to raise the profile of dark skies as an environmental asset we are increasingly at threat of losing. [2]

Dartford has Kent’s lightest skies, 260th of the 326 districts, of course this area has major transport networks, including the Dartford Crossing.

Thanet is 241st in the rankings, with 34% of its skies in the lightest categories. Thanet Earth pledged to improve its greenhouse blinds in 2013, yet the light emitted is still severe. [3] [4] Its maximum brightness value is 584.98nanowatts/cm2*sr, brighter than anywhere else in the South East, including London.

Thanet Earth by Craig Solly 1

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Thanet Earth, photos by Craig Solly

Thanet Earth, photos by Craig Solly

The research comes at a time of increasing awareness of the harmful effects light pollution can have on the health of people and wildlife. That these skies were monitored at 1.30am illustrates just how long into the night England’s lighting spills.

The new maps were produced by Land Use Consultants from data gathered by the National Oceanographic and Atmospheric Administration (NOAA) in America. The NOAA satellite captured visible and infrared imagery to determine the levels of light spilling up into British skies. CPRE is sending lesson plans to primary schools in order to promote the enjoyment of dark skies.

We are calling on the county’s local authorities to use these maps to identify areas with severe light pollution and target action to reduce it, as well as identifying existing dark skies that need protecting.

 

Stars by Tone Netone

Stars by Tone Netone

Starry night by Ethan Sztular

Starry night by Ethan Sztular

CPRE Kent recommends that:

  • Local authorities follow Ashford’s lead and develop policies to reduce light pollution in their emerging local plans.
    The councils use CPRE’s maps to inform decisions on local planning applications and identify individual facilities that should be asked to dim or switch off unnecessary lights.
  • Local businesses review their current lighting and future development plans to save money by dimming or switching off light to reduce pollution as well as meet their promises over reducing existing pollution (e.g. Thanet Earth).

Hilary Newport, director of CPRE Kent said: “Our view of the stars is obscured by artificial light. Many children may not have seen the Milky Way, our own galaxy, due to the veil of light that spreads across their night skies. It is known that dark skies are beneficial to our wellbeing. Light pollution can disturb our sleep, prevent our enjoyment of the countryside and affect wildlife, by interrupting natural rhythms including migration, reproduction and feeding patterns.
“Councils can reduce light levels through better planning, and with investment in the right street lighting that is used only where and when it is needed.
“Our Night Blight maps also show where people can expect to find a truly dark, starry sky and we hope they will go out and enjoy the wonder of the stars.”

Summary of Kent districts (this information and more is available via the maps):

District Ranking out of 329 % in three darkest sky categories, less than 1 NanoWatts / cm2 / sr
Ashford 68 85
Tunbridge Wells 72 76
Shepway 99 74
Sevenoaks 101 47
Dover 106 66
Canterbury 112 78
Maidstone 116 55
Swale 137 47
Tonbridge and Malling 156 32
Medway 196 12
Gravesham 202 0.3
Thanet 241 8
Dartford 260 0

 

Notes:

[1] CPRE’s interactive maps can be accessed at http://nightblight.cpre.org.uk

Light pollution is a generic term referring to excess artificial light that shines where it is neither wanted nor needed. In broad terms, there are three types of light pollution:

  • skyglow – the pink or orange glow we see for miles around towns and cities, spreading deep into the countryside, caused by a scattering of artificial light by airborne dust and water droplets
  • glare – the uncomfortable brightness of a light source
  • light intrusion – light spilling beyond the boundary of the property on which a light is located, sometimes shining through windows and curtains
[2] http://www.ashford.gov.uk/dark-skies-spd-2014

[3] http://www.thanetearth.com/faqs-growing-using-light.html

[4] http://www.thanetgazette.co.uk/skies-Birchington-going-green/story-20253506-detail/story.html

June 13th 2016

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