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U.S. EPA Clean Air Excellence Award Recipient
U.S. EPA Clean Air Excellence Award Recipient
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Top Support Questions is devoted to providing an interactive reference site for industrial air pollution testing and control. Our objective is to provide a user-friendly site for visitors to easily research and find EPA test methods, stack testing firms, regulatory agencies and related services and products. We provide hundreds of web pages to a worldwide audience 24 hours a day, 7 days a week, 365 days a year.


Can I use this site for free?

YES. Visitors have enjoyed unlimited, free access to use the Directories and reference sections with no membership fees nor registration requirements since the site was first published to the Internet August 2000.

To use a specialty service (Classified Ads, Select RFP, Site Sponsorship) or to add a listing to the Directories, companies serving the air pollution testing and control industry have purchased a FEE BASED listing or service.
To order a listing Click Here is a free reference site for buyers & decision makers.
There are no registration requirements nor membership fees
for Visitors to use the free resources on this website.

Our hard work and dedication keeping secure, reliable, updated, informative and credible at no cost for visitors to use has proven outstanding success. Received The U.S. EPA "Clean Air Excellence Award"
in 2003 for "outstanding, innovative efforts in improving air quality through Education/Outreach". The ceremony held in Washington D.C. was highlighted by keynote speaker Governor Christine Todd Whitman, EPA Administrator.


How do I add a listing to

To add your company listing to the Directories Click Here

Then select the Directory and the listing option you would like to place. The online order form will guide you through the process and you can submit payment with a major credit card online in minutes. If you prefer to pay with a U.S. check or money order, select the mail-in order form option.

For help with your order Click Here
To see the benefits of adding a listing Click Here


Can I compare all listing options before I place an order?

YES. Here's How:

  • To compare features & prices of all listing options Click Here
  • To compare options for the Stack Testing Firm Directory   Click Here
  • To compare options for the Services & Products Directory   Click Here
For help placing a listing Click Here


How much does a listing cost?

From just pennies a day to a little over a dollar:

Basic Listing
Premium Listing
Company Profile / Directory Profile
$100 USD / Year
( .27¢ / Day )
$300 USD / Year
( .82¢ / Day )
$500 USD / Year
( $1.37 / Day )


What does the listing fee cover?

The Listing Fee Guarantees:
  • Prompt & Accurate Placement
  • Priority Service & Support
  • Free Logo Preparation
  • Free Updates
  • Online Support Center
  • Annual Renewal Service
  • One Easy Payment Per Year
  • Continued Uninterrupted Service
  • Secure Servers
  • 99.95% Uptime Average

Prompt & Accurate Placement
Your new listing will be processed within 3-5 business days (allow 5-10 business days for Site Sponsorships).

Free Logo Preparation will format or digitize your company logo for you at no cost if you ordered a Premium Listing, Directory Profile or Company Profile. Or mail your logo to us and we will prepare it for you at no cost.

Placement Confirmation Message
You receive a message containing important information about your new listing, Annual Renewal Date, Support and other complimentary services.

Priority Service
Since you have paid a fee for a listing on you are entitled to receive Priority Service
including free updates, indexing by the site's own search engine and more.

Annual Renewal Date
You will be billed only once each year for one easy renewal payment.

Continued, Uninterrupted Service
Over the last 2-year period, the servers that deliver this website to the Internet have provided an outstanding uptime average of 99.95%.


Will my order for a listing be placed quickly?

Your order will be processed within 3-5 business days upon receipt. Please allow 5-10 business days for
Site Sponsorships.


Can I place my linked logo with my listing?

YES. The order form for a Premium Listing, Directory Profile or Company Profile provides instructions for sending your logo artwork by mail or e-mail. Or have scan your logo for you from your website at no cost. If you already have a Basic listing, you can add your linked logo to it by upgrading to a Premium Listing or Profile at anytime. For more information about upgrading
Click Here

Free logo preparation is a complimentary service for customers. For more information about the logo format, free logo policy or how to send us your logo Click Here


Can I add my linked logo to the margins of the Directories?

YES. Very easily. Having your company's linked logo on the margins of the Directories gives visitors instant access to your company's services or products. There are (3) Site Sponsorship packages available and you can order one online in minutes Click Here

Click Here !
ALL THREE Directories
Click Here !
Any Two Directories
Click Here !
Any One Directory

If I purchase a Site Sponsorship do I also pay for my listing?

Yes, if you purchase a Site Sponsorship you must also pay the annual fee for your listing. Each option can be ordered separately online or together by mail, just select the method that is most convenient for you.


Is there any data on how my listing correlates to sales?

Many companies monitor how their listing correlates to sales by looking at their own website's traffic data. The best way to do this is to have your webmaster watch for a rise in incoming hits from your links on Or visit the site statistics page to see the amount of traffic our visitors generate Click Here


How do I get a Username/Password to post free Classified Ads?

You receive a Username/Password to post free Classified Ads when you purchase an Directory Profile or Company Profile. If you purchased a Basic or Premium Listing you will need to Upgrade To A Profile to receive a Username/Password to post free Classified Ads.
  • To Order A Directory Profile For Stack Testing Firms Click Here
    Includes Access To The Secure Area

  • To Order A Company Profile For Related Services & Products Click Here
    Does Not Include Access To The Secure Area

  • To Upgrade From A Basic Or Premium Listing To A Profile Click Here

How do I access the Secure Area?

If your company's PRIMARY business is stack testing, you can access the Secure Area by purchasing a Directory Profile.
For more information
Click Here

* Access To The Secure Area Is Provided To Stack Testing Firms Only *

See Stack Tester FAQs Click Here


What are "Multiple Premium Listings"?
  • Purchase the Premium Listing or Directory Profile option for the Stack Testing Firm Directory
    and get premium listings for each of your office locations for no additional cost
    Click Here

  • Purchase the Premium Listing or Company Profile option for the Services & Products Directory
    and get premium listings for each applicable category for no additional cost
    Click Here

Our primary business is stack testing but we also rent/sell stack testing equipment?

Since your PRIMARY business is stack testing, order a
Directory Profile then place a separate order for a
Premium Listing in the Services & Products Directory. You will then be listed on both Directories and can
enjoy the numerous benefits of having an Directory Profile at the same time.

For listing options & prices Click Here


How do I request updates?

To securely request updates to a FEE BASED listing or FREE service you are using on Click Here

For the security of all companies listed on
requests for updates submitted by e-mail cannot be processed.


How will I be billed for my annual renewal fee?

Once a year will send an invoice to you by postal mail or e-mail prior to your Annual Renewal Date. Prompt payment will automatically renew your services for one more year. You can submit your renewal payment online or by mailing payment with the self-addressed return envelope included in your invoice.

For more information about the Annual Renewal Service
Click Here


Can I upgrade to a bolder listing at any time?

YES. And will prorate your account with an extended annual renewal date as credit for what you have already paid. For instructions on how to upgrade Click Here


Can I reinstall my listing if it has expired?

YES. If your listing has expired or you did not pay the Annual Renewal Fee, simply place a new order for the listing option of your choice and submit payment. will place your new listing option for you within 3-5 business days.

For listing options & prices
Click Here


Why does my purchase reflect the charge by "Emissions Schematics" (or "Emissions")? is owned and operated by Emissions Schematics. If you are using a credit card for your purchase or payment, your statement will reflect the charge by "Emissions Schematics" or abbreviated as "Emissions".

Emissions Schematics, located in Gainesville Florida, has specialized in professional website design services for Attorneys and Engineers
since 1998.

For payment options
Click Here


What is the Services Agreement?

The Advertising Service Agreement is a policy document outlining terms and conditions that must be read and agreed to prior to purchasing a listing for inclusion in the Directories. To read the Service Agreement
Click Here


Who Should Use:

Priority Service: For Customers That Have Already Purchased A FEE BASED Listing Or Service

Customer Service:
For Help Placing An Order For A FEE BASED Listing Or Service

Visitor Support:
For Help Using The FREE Services On

-------------------------------------------------------------------  SUPPORT CENTER HOME

Click Here! Receives Top EPA Award
Visit EPA For Press Release
Priority ServiceCustomer ServiceVisitor Support

About The Support Center
As we provide services to customers in both the United States and abroad, we cannot offer telephone support and
still be able to provide our numerous services at such low prices, and in many instances free. We have
found though that we can help a lot more people in far less time through the online
Support Center than we ever could over the telephone.


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