We all think we know what Ad Quality is. But could there be more than meets the eye?

Let’s start with what everyone agrees on: ad quality matters.

It matters for advertisers trying to get results. It matters for publishers looking to maintain credibility. And it matters for the end users – yes, the ones we’re all supposedly optimizing for – who just want to read the content they came for without being bombarded, interrupted, or ignored.

So how do we measure it?

For the past decade, two words have dominated the answer: 

viewable and human. 

If an ad is shown to a real person and at least half the pixels are visible on screen for a second or more (per the IAB and MRC’s standards), we call it quality.

Case closed, right?

Except, not quite. 

Because being viewable isn’t the same as being seen. And being seen isn’t the same as being remembered – or acted on. 

We know this. 

We’ve always known this. 

But the KPIS we use to measure quality and decide whether or not to place an ad, within specific real estate, don’t reflect that nuance.

The good news is that publishers and advertisers alike are waking up to a more layered understanding of ad quality. One that considers KPIs beyond viewability, considering how long it stayed in view. Whether the user did anything during that time. What else was on the page. And how the ad was served in the first place.

In other words, considering actual performance potential.

Here are five signals that go beyond “viewable and human” – and offer a clearer picture of whether an ad impression was actually worth anything:

1) 𝗥𝗲𝗳𝗿𝗲𝘀𝗵 𝗿𝗮𝘁𝗲 – How often does the publisher refresh the ad slot? Advertisers may not see it, but frequent auto-refreshing can dilute attention and inflate impression counts without delivering real exposure.

2) 𝗧𝗶𝗺𝗲 𝗶𝗻 𝘃𝗶𝗲𝘄 –  Viewability starts the clock. But time in view keeps it running. An ad that hits the minimum threshold may technically count – but one that sticks around for five, ten, or fifteen seconds? That’s where the value lives.

3) 𝗘𝗻𝗴𝗮𝗴𝗲𝗱 𝘂𝘀𝗲𝗿𝘀 – Was the user actively scrolling, clicking, or moving their mouse during the ad’s display? Passive exposure is one thing. Engagement – even indirect – is something else entirely.

4) 𝗔𝗱 𝗱𝗲𝗻𝘀𝗶𝘁𝘆 –  How many ads appear on the page relative to the actual content? A higher ratio often leads to lower attention and a cluttered experience. Quality doesn’t scale with quantity.

5) 𝗔𝗱 𝗰𝗹𝘂𝘁𝘁𝗲𝗿 –  Specifically, how many ads are shown per fold? Even well-designed placements can lose impact when surrounded by noise.

None of these signals are new. 

But treating them as central, not supplementary, is. 

In doing so, we move away from treating impressions as a numbers game – and start treating them as a contextual one.

Instead of asking: Was the ad viewable?

The question becomes: Was it viewable in a way that made it matter?

In the next two parts of this series, we’ll zoom in. 

First, we’ll explore time-based signals – what they reveal, how they’re often hidden, and why they matter more than ever. 

Then we’ll examine environment-based factors that determine whether an ad stands out or gets swallowed by the screen.

Stay tuned.