Some PM25 is obviously bad whether the source in natural or man made and some not so bad with some down right desirable. Desirable and not so bad depends on the individual or group of individuals being exposed to the aroma. I personally think some colognes and perfumes should be banned. The EPA also noted that there is a point of no gain. People with hyper sensitivities will continue to be hyper sensitive.
With PM25, too much is bad, but what is too much subjective. If you attempt a zero tolerance policy, you will never get there. In fact, the more you reduce one type of PM25 the more another type becomes "noticeable".
In the US and other "developed" countries, clean air and water acts have worked to reduce particulate matter in the air where the sources are vehicles and industrial combustion sources. Industrial combustion sources would be power plants for electrical generation and manufacturing processes like concrete, Central electric power replacing coal and wood as home heating and cooking energy reduced the majority of urban air pollution followed by passenger vehicle emission standards.
As Urban living expanded into suburban sprawl, more limits were placed on central power plants for industry and electrical power. Even with Coal as a power source, emissions were reduced with scrubbers and precipitators greatly improving air quality. Changing farm practices, starting after the US dust bowl, have also helped reduce PM in the air.
However, the US and industrial nations are not in this world alone. Emerging economies are going through the same growing pains and will need to improve their own emissions standards.
This produces the conundrum, how clean is clean or what tolerances are most beneficial and cost effective. Technology exists to make any form of fuel source cleaner and more efficient but never perfectly clean or efficient. The closer to zero tolerance regulations shoot for the more expensive basic energy needs become. With PM25 the problem is exacerbated by the diverse natural sources of "pollution".
Living on the edge of the tropics, one of the primary sources of harmful PM is the Saharan Desert and the entire middle eastern desert regions. Caribbean asthma cases are directly linked to African dust along with coral reef damage due to fungi, molds, bacteria and viruses non native to the region killing off key species that help keep the reef system clean. Sea urchins feed on algae that compete with coral polyps. There was a massive die off of sea urchins due to Saharan Dust. Along with the coral, sea fans were also impacted weakening the entire reef ecosystem. In a weakened state, any number of other factors can appear to be a "cause" of reef die off, when a mutation of a fungi variety found in African soils was the initial most likely "cause".
It isn't just African dust. The Island of Barbados top soil is almost completely composed of African dust. African dust has been brought to the Caribbean as long as there have been African deserts and trade winds. The die off could be due to a combination of microbe evolution, land misuse in Africa and changing weather patterns. The rough year of the demise of sea urchins was 1983 for those looking for a climate change connection.
Wikipedia has an interesting animation of particulate matter migration around the globe. the sulfates in white are obvious over China, red/orange is dust located mainly in desert regions, Blue is the relatively benign salt spray, but energy salt spray can carry microbes, and green is black and organic carbon produced by any type of fuel combustion which appears to be mainly biomass burning related to agricultural and underdeveloped nations using biomass for basic fuel.
With developed nations still using fossil fuels including coal, current technology appears to be ahead of the pollution curve. Similar cleaner central energy and more eco-friendly agriculture would appear to have a larger potential to reduce man made particulates and reduce "natural" particulates than extreme regulation of fossil fuels. Especially when the poorest nations in the world appear to be producing the vast majority of air pollution via land use.misuse.
The minions of the Great and Powerful Carbon tend to side step this reality with their carbon causes everything bad simplistic reasoning. Taking fossil fuel use to zero is unlikely to reduce PM25 by more than 30% and less than 10% of the outdated or unregulated uses likely produce the majority of the emissions. It would seem having the rest of the world emulate the developed world's modest measures to reduce air pollution would be much more effective and much less costly. That has a snowball's chance in Hell of happening with the minions running loose though. They have a, ban coal first then sort out the rest, playbook. To most engineers coal is just a resource with advantages and disadvantages, just like nuclear, oil, gas, solar, wind and biomass. It isn't good to be overly reliant on any one or totally opposed to any one. Finding the proper mix for a situation is the goal.
Eliminating any energy option isn't particularly intelligent, especially when it is tied to a global issue that could be mainly natural or at least, the majority isn't related to that energy option.
So what are the risks associated with outdoor pollution? According to this Cancer Research UK article pretty small but there is definite link between outdoor pollution and lung cancer. If you smoke you are about 20 times more likely to develop lung cancer and some studies put a 22% increase in risk per multiples of 10 micron exposure. 15 microns/cubic meter was considered the upper limit in the US for "clean" air but there was a move to regulate at 12 microns per cubic meter. So if you live into your fifth decade you have a risk of lung cancer. As you live longer your risk of other causes increase so your lung cancer risk decreases. The longer you live the greater your chances of dying from something which I am sure must come as a surprise to many.
With lung cancer being a fifth decade typical onset disease, the developed world clean air acts being roughly 40 years old and people transitioning from "dirtier" manufacturing and construction trades to "cleaner" service related industries, there are plenty confounding factors to be dealt with in determining how significant a problem PM25 really is. Cleaner air though would be better, but since the current air quality is just marginally significant as a carcinogen, maintaining the status quo of incremental, cost effective progress towards better air quality seems more rational than drastic changes that could produce unintended consequences.
Dramatic, note the root drama, change is very progressive though. There is no problem so small it doesn't deserve our immediate attention. With anarchists who do not wish to be governed setting out to become the governors, it should be obvious there will be plenty of piggyback political baggage involved in all the progressive initiatives to save the world. It is impossible to make everyone happy, but the progressive haven't come to grips with that basic reality. It is good for them though since there will always be some cause to occupy their idle musings.
In the real world, you do the best you can in a way that doesn't break the bank and you leave your options open.
For another opinion on air pollution consider the real issue, indoor air pollution. Bjorn Lomborg has a article in Forbes that is right on target. With a third of the world population still cooking over open flames be the energy source dung, coal or wood and developed nations enjoying tightly constructed central air condition dwellings, indoor pollutants are the real killer other that urban areas in rapidly developing countries that haven't addressed clean air regulation adequately. Since this problem doesn't mesh with the carbon issue, it is not getting attention it deserves. Centralized power generation and rudimentary electrification even using demon coal as a fuel source would reduce the third world problem while more timely maintenance and a bit of bleach would do wonders in the developed world.
In the developed world, water plus dirt produces molds. Drywall is dirt sandwiched between paper with makes great mold growing habitats when you add water. Dirt in air conditioning systems with their dark, moist interiors can produce wonderful mold science projects. So all the while scientists study the impacts of outdoor particulate matter their subjects can be getting much more at home.
Real science needs to deal with the confounding factors before condemning progress in the name of progressive-ism. As it is, they are coming up with too many solutions for the wrong problems.
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