Sentences with phrase «ozone levels fell»

Still, arctic ozone levels fell during most winters in the 1990s, making researchers worry that a northern ozone hole might appear.

Another data point in the continuing public discussion of EPA's plan to make the nation's standards for ozone more restrictive, even as the existing standards have ozone levels falling 18 percent from 2000 to 2013 — and giving every indication levels will continue to fall.

Not exact matches

If Lu's suggestion is correct, ozone levels should fall then rise every 11 years, in step with changes in cosmic - ray intensity driven by the 11 - year solar cycle.

Although chlorine levels are falling, thanks to agreements that banned chlorofluorocarbons, levels of bromine — which is 45 times more effective at zapping ozone — are still rising, says atmospheric chemist Dale Hurst of the National Oceanic and Atmospheric Administration in Boulder, Colorado.

As levels of ozone, nitrogen dioxide and particulate matter fell over time, so did the number of children who reported a daily cough, persistent congestion and other symptoms of irritated lungs.

Press reports last weekend revealed that, locally and for short periods, ozone levels in the upper atmosphere fell during the past month to between 10 and 40 per cent below normal as far south as Shetland.

The effect of solar activity in fall 2003 was strong, but it was limited to levels well above the actual ozone layer.

Today — rising natural gas use plays a key role in falling emissions of carbon dioxide — even as levels of methane and ozone decline.

Atmospheric scientists previously observed that levels of ozone - depleting CFCs were falling in the stratosphere (the level of atmosphere between 5 and 30 miles up in the sky) above Antarctica.

If this happens during northern winter, surface pressure falls in the Arctic (rising AO) the night jet stalls, NOx injection falls away, stratospheric ozone levels increase, the coupled circulation is invigorated and pressure falls at 50 - 60 ° north and this is associated with cloud loss (when global cloud cover is at its maximum value) and a strong rise in global sea surface temperature.

Then the ozone at the lower levels below 45Km starts to fall a year later.

The Polar bears stubbornly refuse to go extinct, indeed the buggers are thriving, the glaciers don't appear to be disappearing, sea levels have stayed boringly level, we haven't been subsumed by hordes of desperate climate refugees, the polar ice caps haven't melted, the Great Barrier Reef is still with us, we haven't fought any resource wars, oil hasn't run out, the seas insist on not getting acidic, the rainforest is still around, islands have not sunk under the sea, the ozone holes haven't got bigger, the world hasn't entered a new ice age, acid rain appears to have fallen somewhere that can't quite be located, the Gulf Stream hasn't stopped, extreme weather events have been embarrassingly sparse in recent years and guess what?

If ozone levels decline, for instance, temperatures in the stratosphere will fall.

In fact, the number of asthma cases grew by millions at the same time as ozone levels were falling,» Kerrigan concluded.

Montana Chamber of Commerce, Business and the Law Conference, Federal Impacts on MT Employers — Immigration & NLRB Update, March 14, 2018 (Helena, Montana) Montana Medical Association Interim Membership and Board of Trustees Meeting, Health Care Legislation Highlights, February 17, 2017 (Helena, Montana) Montana Energy Conference, Legal Obstacles to Energy Development: Clean Power Plan and Ground Level Ozone, March 29, 2016 (Billings, Montana) CERCLA Successor Liability, fall / winter 2015 (Montana, Wyoming, North Dakota) Montana Energy Law Seminar, Governmental Affairs & Legislative Update, August 31, 2015 (co-presented with Aimee Grmoljez)(Billings, Montana) EPA's Proposed Reduction to Ground Level Ozone NAAQS, January 2015 (Montana, Wyoming, North Dakota) R.S. 2477 Litigation and Legislation Presentation for the Alaska State Bar Association and a coalition of corporate landowners in Alaska, winter / spring 2014 (Anchorage, Alaska) «Banking for Salmon: How to Balance the Klamath Basin's Liquid Ledger Sheet with a Comprehensive Basin - Wide Water Bank,» Editorial, VT..