Trans4mind Home Page
~ A Journey of Self-Discovery ~

Explore Article Library

Allergies, Asthma and City Trees

Allergies, Asthma and City Trees

Thomas Leo Ogren

Some urban tree species cause an inordinate amount of asthma and allergy problems, while other tree species cause little or no health problems. A large part of the problem is that the arborists and landscape professionals, who plant these trees, often don't know the difference.
The type of trees (and shrubs) used in modern city landscapes has changed dramatically in the past three decades. In the past, the majority of street trees used were perfect-flowered, insect-pollinated trees, such as the once so common American elm tree.
Today though, many of the most widely used city trees are wind-pollinated species. Most of these species are unisexually flowered (dioecious and/or monoecious) and further compounding the problem, thousands of popular cultivars sold today are touted to be 'seedless,' 'low-maintenance,' 'pod-free' or 'litter-free.'
These fruitless, seedless trees are male plants, all male, and male trees produce prodigious amounts of allergenic pollen. Female trees produce NO pollen what so ever.
In dioecious-flowered trees such as most ash, willow and poplars, it is easy to propagate male only trees because they are separate-sexed. Monoecious trees, which in Nature always have both sexes (male and female flowers) on the same tree, also usually produce abundant pollen. It is possible to have all-male trees from the monoecious species. On many species the sexes will be born on separate branches, such as on a Honey Locust tree. If you take cuttings, or budwood, only from the branches with male flowers, then, you'll get an all-male tree. Lots of monoecious Acer spp. cultivars are male-only plants. In a somewhat different way, there are also numerous monoecious species where only the top or only the bottom will have either male or female flowers. For example, the bottom half of a mature Italian Cypress for example is all-male. Female
wood is found only at the top of the plant. Thus, scion wood taken from the bottom usually produces "seedless" plants.
The terms 'dioecious,' and 'monoecious,' are botanical terms, not horticultural terms. We could perhaps say that a manipulated, asexually propagated all-male cultivar, taken from a monoecious species, is now 'dioecious,' but this is not quite correct. A proper dioecious tree is one that in Nature is separate-sexed. These modern engineered trees are never found in Nature.
Interestingly, the first reference in print I ever found to this single sexing-out with monoecious street trees, was in a USDA booklet, from 1982, called 'Genetic Improvement of Urban Street Trees.'

How Bad Is Allergy Now?
In 1959 the official rate of allergy in the U.S. was between 2 to 5% of the public. By 1999 the official rate of allergy had increased to an incredible 38% of Americans. Asthma, which was once considered rare, is now the number one chronic childhood disease in the US.

Where are Allergies and Asthma the Worst?
The most common allergen of all is pollen and since there are so many more plants growing in the country than in the city, it would make sense then that there is more allergy and asthma in the countryside. Right? No, wrong! Allergies and asthma are far worse in the city than they are in the country.

Several things contribute to this:
1.Pavement makes a poor pollen trap. Pollen in the city often lands on pavement where wind can cause it to become airborne again. In naturally vegetated areas where there is much more vegetation, pollen often lands on and becomes stuck in grasses, shrubs and vines or in trees.
2.Cities have more air pollution, which weakens the immune system and lung function.
3.Stress, which is generally higher in cities, can contribute to both asthma and allergy development.
4.Increased carbon dioxide levels within cities causes pollen-forming plants to produce more pollen with each bloom cycle, and also often causes urban plants to bloom more often.
5.Pollen loads are actually far greater in cities because there is a sexual imbalance within the plant community. In the city there is a preponderance of male trees and shrubs, while in the rural areas there is almost always a complete balance of plant sexuality. The excess of male plants in the city results in an excess of pollen.
6.The very lack of female plant materials in the urban environment also is a prime factor in the epidemic of allergy and asthma. Female flowers carry an electrical negative (-) charge (the trees are grounded with their roots) and airborne pollen holds a positive (+) charge. The tree and the pollen are mutually attractive; thus a female plant becomes a very effective pollen trap for pollen of its own species. But with almost no female trees and shrubs in modern landscapes, most of the pollen remains airborne.

How to Improve Health and Air Quality through Tree Selection
Landscaping to reduce allergies, especially pollen allergies, is an idea that is coming into its own. In the past few years several books have been written on the subject and interest is growing rapidly.
With the addition of OPALS', (Ogren Plant-Allergy Scale) arborists now have a means to design allergy-free plantings. This scale ranks all landscape plant materials on a simple 1 to 10 allergy basis. Trees that produce zero pollen, e.g., female cultivars, usually rank the best 'number one. Trees that have abundant, highly allergenic pollen, especially those with very long bloom periods, are usually ranked the worst 'in the 9-10 range. There are many trees and shrubs, however, that fall somewhere in between. Using a list of over 100 factors, OPALS' numerically ranks each species and then further ranks the individual cultivars. There are often dramatic allergy differences even between two species in the same genus.

How Are Plants Allergy-Ranked?
OPALS' was developed based on the following considerations: 'What do plants that are well known to cause allergies have in common?' and 'What do plants that are well known NOT to cause allergies have in common?' With these two questions it was possible to build two opposing sets of medical-botanical-allergy criteria. One set is positive and one set is negative. Examples of negative criteria: tiny flowers, excerted stamens, small (less than 25 microns in diameter) sized pollen grains, extended bloom period. Examples of positive criteria: complete flowered, sticky, heavy pollen grains, presence of nectaries, brief bloom period.
There are now over a hundred criteria used to develop OPALS' rankings. Individual landscapers, city arborists, the USDA and the American Lung Association have already use the scale to make better landscaping decisions.
Based on the plant-allergy scale it is now possible to state, for example, that Acer rubrum '- Red Sunset' maple, is ranked number one and causes no allergies. By comparison, 'Autumn Spire,' a male cultivar of red maple does cause allergies and is ranked number nine. Most Pine trees will rank at numbers 4 to 5 and will cause some allergy. Platanus species (sycamore) rank number eight, and cause quite a bit of allergy. A male Canary Island Palm, Phoenix canariensis, which is considered one of the worst at a ranking of 10, will produce an abundance of pollen that will cause severe allergic reactions to many living nearby.
Pollen dispersal rates have been measured since 1972 (Gilbert Raynor, NY meteorologist) and although many pollen grains travel far in the air, research shows that most often 99% of a tree's pollen falls out and sticks within fifty feet of the tree. This means that the closer one is to the pollinating tree the greater the exposure. Thus, the job for arborists is to plant trees that will not expose everyone near them to allergenic pollen.

So, How Do You Tell the Boys from the Girls?
It isn't always that obvious by looking at a tree (especially a young tree) as to whether or not it is a pollen-free female or a pollen-producing male. But since so many city trees are now asexually produced cultivars, the sex is predetermined. In the book Allergy-Free Gardening, which is the result of 15 years of research on this subject, several thousand trees were individually sexed and allergy-ranked. In some cities, pollen control ordinances are already on the books, although most of these could be improved an updated. Albuquerque, New Mexico is particular interesting, since it has attempted to curb allergies by prohibiting the sale and planting of any male cultivars.
As the public grows more knowledgeable about allergy-free landscapes, municipal arborists and landscape specialists will want to be ahead of the curve. They will want to show their clients that they are well-informed on the subject. In the future, instead of planting high allergy-trees, they will need to plan and plant 'healthy' urban landscapes.

1.Lewis, Walter H., Airborne and Allergenic Pollen of North America, John Hopkins University Press, Baltimore, Maryland, 1976.
2.Jacobson, Arthur Lee, North American Landscape Trees, Ten Speed Press, Berkeley, California, 1996.
3.Koch, Christopher Von, Allergy, Die Woche, pg. 27, July 7, 2000, Hamburg, Germany.
4.Dworschak, Manfred, Der Spiegel, Feind am StraBenrad, Pp. 174, 175, Nr. 29, 2000.
5.Ogren, Thomas Leo, Turn Back the Pollen Clock, New Scientist, London, Pp. 46, 47, June 3rd, 2000.

About the Author
Thomas Ogren is the author of Allergy-Free Gardening, Ten Speed Press. Tom does consulting work on plants and allergies for the USDA, county asthma coalitions, and the Canadian and American Lung Associations. He has appeared on HGTV and The Discovery Channel. His book, Safe Sex in the Garden, was published in 2003. In 2004 Time Warner Books published his latest book: What the Experts May NOT Tell You About: Growing the Perfect Lawn. His website:


Careers & Employment
Grief & Loss
Kids & Teens
Public Speaking
Self Help
Self Improvement & Motivation
Sexual Relations
Stress Management
Travel and Leisure

From our extensive site, you'll find good info on many topics using this search:

Want to renew your life?

Our online, interactive video workshops present the most effective methods of holistic personal development...
Start off with a Free Life Assessment and a Free Consultation...

Have a question about Trans4mind Training?

Frequently Asked Questions
What Are Our Fees?
Email Peter Shepherd

Support your personal development with these popular and effective hypnosis downloads...

  • Public Speaking Fear ~ Banish speaking anxiety and nerves with hypnosis.
  • Motivate Yourself to Exercise ~ Build a powerful exercise habit that you can't break.
  • Get Rid of Fear & Anxiety ~ Stop worry and apprehension wrecking your life.
  • Self Esteem ~ Break the negative trance of low self esteem and give yourself a chance in life.
  • Create Your Own Reality ~ Use the power of your unconscious mind to transform your life.
  • Deeper Self Respect ~ Use hypnosis to connect with your true inner worth.
  • Detach From Fear ~ Tune out nervousness and anxiety with hypnosis.
  • Improving Concentration and Focus ~ Learn how to discipline, direct and command your mind to improve your performance.
  • Exercise Motivation ~ Give you powerful keys to getting back on track with your exercise - and staying there.
  • Overcoming Shyness ~ Provides an invisible security blanket allowing you to develop social ease and overcome shyness.
  • Quick Confidence Booster ~ An audio hypnosis session that's specifically designed to get you (quickly!) back on track.
  • Stop Negative Thoughts ~ Learn powerful hypnotic techniques to stop negative thoughts before they start.
  • Overcoming Procrastination ~ Let hypnosis help you get on with what you need to do, when you need to do it. Let nothing hold you back.
  • Think Thin ~ Use hypnosis to re-train your brain and lose weight naturally... that's how to get and stay slim.
  • Fall Asleep Fast ~ Relearn how to fall asleep fast and enjoy a good night's sleep.
  • The Next Level ~ Designed to radically boost your performance in any field. It's based on a technique used by top athletes and other successful people to help them make a big stride forward.
This is our selection of favorites, but there's a session for every need! Choose from over 800 Hypnosis Downloads...
Search now on an issue that interests or concerns you...

Welcome to the New Wave in Meditation Technology

Click here to learn more about the iAwake Profound Meditation Program
The iAwake Profound Meditation Program
is a way of enhancing your meditation practice, making meditation not only easier and more enjoyable, but also more efficient and effective.
Profound Meditation provides the smoothest, deepest, richest, most profound meditation experience available anywhere...
Here is a link to a free 20-minute track from iAwake Technologies - a sample of the type of tools that will deepen your meditation immediately and help you quickly become a successful meditator. It's the opening track of iAwake's flagship product, the Profound Meditation Program, called the iAwake Experience...
Learn More and Download the iAwake Experience
We think you'll find this technology a tremendous aid on your transformative journey of becoming your best and most creative self - and you can get started today!
And here's a fantastic resource for self-education...

The World of Inspiration eLibrary

World of Inspiration
A treasure trove of personal development wisdom

Step inside. Just like a real library, there are thousands of quality eBooks presented on three "floors" and in different "rooms." To purchase your $15 Lifetime Membership to the World of Inspiration eLibrary, click the following button:

Payment is made through our secure transaction agent, PayPal.
The transaction is in the language and currency of your choice.
"I want to just say 'WOW!' This collection is probably the best money I ever spent! I've already received many times over in personal enrichment after just 9 days. I've had a past metaphysical background, but even newcomers to this material will really benefit. Thanks again." ~ J.S. (Pennsylvania, USA)
"The collection is everything which you promised. And more! A superb contribution to the good of the world. Many thanks indeed." ~ R.P. (Georgia, USA)
"Just a short note of thanks for the library. I've only had membership for several days now but I already feel this is perhaps the most interesting compilation I have yet seen. Worth far more than the price of admission. The browser linked structure works well and makes it easy to manage such a large storehouse of information. It is rarely that I find something I like as much as this or that I feel strongly enough to write a note like this." ~ P.W. (Minnesota, USA)
Copyright © 1997-2016 Trans4mind Ltd