The best air purifier for smoke creates a cleaner sanctuary by effectively trapping particulate matter and neutralizing odors. It’s an essential investment for individuals sensitive to airborne irritants, households with pets, or those living in areas prone to wildfire smoke. Choosing the right unit involves understanding varying CADR ratings, filter types, and square footage coverage.
A suboptimal choice can lead to wasted energy, ineffective air cleaning, and continued exposure to pollutants. Factors like noise levels and maintenance requirements also significantly impact user experience, making informed selection crucial for optimal performance and lasting satisfaction.
To help you breathe easier, we’ve curated a list of the top-performing air purifiers designed to combat smoke. Explore our selections to find the perfect solution for your needs.
For the best air purifier for smoke, consider models with AHAM verification and high CADR ratings, such as the LEVOIT Air Purifier for Home Allergies Pet Hair in Bedroom or the WINIX 5510 Air Purifier. These units effectively capture smoke particles using True HEPA filtration and are certified for performance in specific room sizes.
The Best Air Purifier for Smoke: Top Picks
| Image | Product | Buy |
|---|---|---|
Best Pick 1  | LEVOIT Air Purifier for Home Allergies Pet Hair in Bedroom, Best for: Pet owners’ dream | Check Price |
Best Pick 2  | PuroAir 240 HEPA Air Purifiers for Home Large Rooms – Best for: Spacious living areas | Check Price |
Best Pick 3  | LEVOIT Air Purifiers for Home Large Room Up to 1875 Best for: Big room coverage | Check Price |
Best Pick 4  | LEVOIT Air Purifier for Home Large Room Up to 1073Ft² Best for: Large area purification | Check Price |
Best Pick 5  | LEVOIT Air Purifier for Home Bedroom Dorm Room, Smart & Best for: Dorm room essential | Check Price |
How We Picked
To determine the best air purifier for smoke, we prioritized AHAM Verified models, ensuring certified performance and reliable smoke filtration for real-world effectiveness. We evaluated build quality, looking for durable construction and user-friendly designs. Standout features like smart capabilities and advanced multi-stage filtration systems were key differentiators.
Products demonstrating powerful, rapid air cleaning were favored, with an emphasis on safety and long-term durability. Models that fell short on these fundamental criteria or lacked clear performance metrics were ruled out.
What Most Buyers Get Wrong
Smoke Particle Size Matters
When choosing an air purifier for smoke, pay close attention to the CADR (Clean Air Delivery Rate) specifically for smoke. Smoke particles are incredibly fine, often much smaller than typical dust or pollen. A higher smoke CADR indicates the purifier can more effectively capture these tiny irritants.
Look for models with certified performance in this area, like the KNKA, which lists a specific smoke CADR, or those with strong AHAM verification, as this often correlates with effective smoke filtration.
Beyond HEPA for Odors
While a True HEPA filter is essential for capturing smoke particles, it won’t always eliminate lingering odors. For smoky environments, an activated carbon filter is crucial. This layer adsorbs odor molecules, removing that stale smell that smoke leaves behind.
The WINIX 5510, for instance, often includes an activated carbon pre-filter. Prioritize purifiers with a substantial carbon filter component to truly tackle both the particles and the persistent smell of smoke.
1. LEVOIT Air Purifier for Home Allergies Pet Hair in Bedroom,
Best for: Compact solution for smaller spaces.
With a 3-in-1 filtration system, this unit captures particles down to 0.1 microns, effectively filtering out smoke and allergens. Its portable design allows for easy placement in bedrooms or smaller living areas, ensuring cleaner air where you need it most.
This air purifier covers up to 1073 square feet and operates at a low noise level of 24 decibels, making it suitable for continuous use without disruption. The touch control method offers straightforward operation, complementing its specialized filtration capabilities.
Pros
- AHAM Verified for performance assurance
- 0.1 Micron particle retention size
- 24 Decibel noise level for quiet operation
- Portable design for easy relocation
Cons
- Limited floor area coverage compared to larger models
Opt for this LEVOIT model when you need a verified air purifier for a bedroom or apartment. It’s designed for efficient smoke and allergen removal in smaller environments.
2. PuroAir 240 HEPA Air Purifiers for Home Large Rooms –
Best for: Powerful filtration for large living areas.
Capable of cleaning rooms up to 1,000 sq ft in one hour, this PuroAir unit utilizes a 3-layer HEPA filtration system including activated carbon. This ensures comprehensive removal of smoke particles, odors, and airborne irritants from large spaces.
The 22-wattage motor powers a system that captures particles as small as 0.1 microns. Its button control interface is simple to use, featuring an automatic air quality sensor and indicator to keep you informed about your home’s air.
Pros
- Cleans 1,000 sq ft in one hour
- 0.1 Micron particle retention size
- 3-layer HEPA with Activated Carbon filter
- Automatic air quality sensor
Cons
- Not smart home compatible for remote control
Choose PuroAir for rapid air purification in substantial living rooms or open-plan spaces. It’s ideal for homes needing robust smoke and allergen defense.
3. LEVOIT Air Purifiers for Home Large Room Up to 1875
Best for: Smart control for expansive areas.
This AHAM Verified air purifier covers an impressive 1875 square feet, allowing for thorough smoke and allergen removal across large homes. Its 3-stage filtration system captures microscopic particles, ensuring cleaner air throughout the main living areas.
Operating at 51 watts, this unit features app control for convenience, integrating smart home compatibility. The 0.1 micrometer particle retention size means it effectively tackles fine smoke particles and other airborne contaminants in extensive environments.
Pros
- Covers up to 1875 sq ft
- Smart home compatible with app control
- 0.1 Micrometer particle retention
- AHAM Verified for certified performance
Cons
- Higher noise level at 27 decibels
This LEVOIT model is perfect for large homes or open-plan living spaces requiring smart, high-capacity air purification. It provides effective smoke removal with the convenience of app control.
4. LEVOIT Air Purifier for Home Large Room Up to 1073Ft²
Best for: Voice-activated cleaning for large rooms.
This AHAM Verified purifier cleans spaces up to 1073 square feet, equipped with a 3-stage filtration system that captures particles down to 0.3 micrometers. Its voice control compatibility via Amazon Alexa and Google Assistant makes managing air quality effortless.
With 42-watt power consumption, it offers a 23-decibel noise level for quiet operation, ideal for keeping living areas comfortable. The washable pre-filter contributes to longer filter life, efficiently removing smoke, dust, odors, and dander.
Pros
- Smart home compatible with voice assistants
- AHAM Verified for performance
- 0.3 Micrometer particle retention
- Washable pre-filter feature
Cons
- Particle retention size is slightly larger than some competitors
Select this LEVOIT purifier for large rooms where voice control is desired for managing smoke and allergens. It suits tech-savvy homeowners seeking certified air quality.
5. LEVOIT Air Purifier for Home Bedroom Dorm Room, Smart &
Best for: Smart, portable unit for personal spaces.
This AHAM Verified air purifier is optimized for rooms up to 675 square feet, featuring app, touch, and voice control for seamless operation. Its 3-in-1 filtration system targets smoke, odors, and allergens down to 0.1 microns.
Running at 45 watts with a 24-decibel noise level, this unit is designed for bedrooms or dorm rooms, ensuring quiet and efficient air cleaning. The multi-particle and allergen filter class effectively removes a wide range of airborne contaminants.
Pros
- App, touch, and voice control options
- AHAM Verified for reliable performance
- 0.1 Micron particle retention size
- Quiet 24 decibel operation
Cons
- Smallest floor area coverage among the reviewed models
Ideal for bedrooms or college dorms, this LEVOIT smart purifier offers targeted smoke and allergen removal in smaller personal spaces. Its compact and portable design fits easily into any room.
6. WINIX 5510 Air Purifier (New Generation of 5500-2 with App
Best for: Smart control for smoke-prone homes.
With 65 watts of power and WiFi connectivity for app and voice control, the WINIX 5510 integrates seamlessly into smart homes, actively managing air quality in rooms up to 392 sq ft, or 1,882 sq ft in one hour. This allows for proactive management of smoke and airborne irritants. Its True HEPA filter captures 99.99% of particles as small as 0.01 microns, ensuring a significant reduction in smoke particulates impacting your air. The Advanced Odor Control Carbon Filter tackles lingering odors from cooking or smoke, further enhancing your environment by reducing VOCs. This combination makes it ideal for maintaining clear airways and a fresh atmosphere even with persistent indoor smoke sources.
This purifier covers 392 sq ft independently and cleans larger spaces rapidly, such as 1,882 sq ft in 1 hour or 627 sq ft in 20 minutes. Its True HEPA filter targets particles down to 0.01 microns, with an Advanced Odor Control Carbon Filter designed to catch indoor airborne particles and reduce VOCs from smoke and cooking. The unit boasts WiFi and PlasmaWave technology for enhanced air treatment. Its Electric power source and Touch control method provide user-friendly operation, while its 27 Decibel noise level ensures quiet performance.
Pros
- Captures 99.99% of airborne particles down to 0.01 microns via True HEPA
- Reduces VOCs and household odors with Advanced Odor Control Carbon Filter
- WiFi and voice control (Alexa, Google Assistant) for smart management
- Cleans large areas quickly: 1882 sq ft in 1 hour, 627 sq ft in 20 mins
Cons
- Requires a replacement filter approximately every 12 months for optimal performance.
For households dealing with frequent smoke, this WINIX model offers smart, efficient air purification. Its ability to manage both particulates and odors makes it a robust solution for ensuring cleaner, fresher air in connected living spaces.
7. KNKA Air Purifier for Home Bedroom Large Room Up to
Best for: Rapid air, dual intake design.
Achieving a Smoke/Dust/PM2.5 CADR of 226 CFM, the KNKA Air Purifier utilizes dual front-and-back air intakes and dual side outlets for concentrated airflow, accelerating air exchange in rooms up to 350 sq ft. This design maximizes circulation for swift purification, making it effective for quickly clearing smoke from your environment. The unit employs a 3-Stage Filtration system, including HEPA and Activated Carbon, to effectively capture airborne contaminants. Its quiet operation at 24 Decibels ensures it won’t disrupt your activities while it works to improve air quality.
This KNKA purifier boasts a Smoke/Dust/PM2.5 CADR of 226 CFM (384 m³/h) and a Pollen CADR of 244 CFM (415 m³/h), certified by AHAM for effective, high-speed purification. It covers 350 sq ft with its dual intake and outlet design for faster air exchange. The system includes a washable pre-filter, HEPA, and activated carbon filter layers, targeting particles as small as 0.3 microns. Additional features include an AQI display and multiple modes like PET, ECO, AUTO, and SLEEP.
Pros
- High CADR of 226 CFM for effective smoke removal
- Dual intake and dual outlet design for accelerated air exchange
- 3-Stage Filtration with HEPA and Activated Carbon
- Quiet operation at 24 Decibels
Cons
- The HEPA filter is rated for particles down to 0.3 microns, which may not capture the very smallest smoke particles.
Ideal for bedrooms or medium-sized rooms where smoke is a concern, this KNKA purifier offers fast and efficient air cleaning. Its strong CADR and airflow design target smoke quickly, providing noticeable relief.
8. BLUEAIR Air Purifiers for Large Rooms, Cleans 3,048 Sqft In
Best for: Expansive coverage, quiet performance.
Cleaning up to 3,048 sq ft in 60 minutes, this BLUEAIR purifier from its Pure Max series employs proprietary HEPASilent dual filtration technology, delivering up to 83% faster cleaning with 50% less noise. This makes it exceptionally effective at rapidly clearing smoke from very large areas while maintaining a quiet environment. Its ability to clean 635 sq ft in about 12.5 minutes is ideal for rapidly mitigating smoke emergencies. The purifier targets airborne contaminants down to 0.1 microns, ensuring comprehensive air quality improvement in expansive living spaces.
This purifier cleans a substantial 3,048 sq ft space in 60 minutes, or 1,524 sq ft in 30 minutes, thanks to its HEPASilent dual filtration. It’s Quiet Mark certified, operating between 23-53dB, and traps particles as small as 0.1 microns. The unit features an Activated Carbon filter to address odors and VOCs commonly found in smoke. Its smart home compatibility allows for app control via Amazon Alexa, Android, and iOS devices. This model is designed for very large rooms and open-plan living areas where smoke can quickly disperse.
Pros
- Cleans large areas rapidly: 3048 sq ft in 60 mins, 635 sq ft in 12.5 mins
- HEPASilent technology for faster, quieter cleaning
- Captures particles down to 0.1 microns
- Quiet Mark certified, with noise levels from 23dB
Cons
- Has only one filter type listed, Activated Carbon, which may not be sufficient for comprehensive particle capture alone.
For large homes or open-concept spaces dealing with significant smoke, this BLUEAIR purifier provides unparalleled rapid coverage. Its combination of speed and quiet operation makes it ideal for swiftly clearing the air without disruption.
9. Afloia Air Purifiers for Home Bedroom Large Room Up to
Best for: Affordable, multi-speed smoke clearing.
Delivering 4 complete Air Changes/Hour for rooms up to 269 sq ft, the Afloia Air Purifier can purify 1076 sq ft spaces in just one hour, making it efficient for quickly addressing smoke and allergens. Its 23-watt power consumption supports rapid air cleaning, while the 3-layer filtration system captures pet dander, dust, pollen, and smoke down to microscopic levels. The 22 Decibel noise level ensures it operates quietly, even on higher settings. This versatile unit is suitable for various rooms where smoke or odors are a concern, offering a cost-effective solution for improved indoor air quality.
This Afloia purifier achieves 4 Air Changes/Hour in 269 sq ft rooms and can clean 1076 sq ft in one hour, making it effective for smoke removal. Its advanced 3-layer filtration captures particles down to microscopic sizes, targeting allergens and smoke. The unit has 3 fan speeds, operates at a quiet 22 Decibels, and features a color-changing night light. With a low 23-watt wattage, it provides energy-efficient operation for continuous air purification in bedrooms, living rooms, and offices.
Pros
- Purifies 1076 sq ft in one hour
- Advanced 3-Layer Filtration for smoke and allergens
- Quiet operation at 22 Decibels
- Low 23-watt power consumption
Cons
- Covers smaller primary rooms (up to 269 sq ft) for optimal air changes.
For smaller apartments, bedrooms, or individual rooms affected by smoke, this Afloia purifier offers a budget-friendly and quiet solution. Its rapid air exchange rate makes it effective for quickly improving air quality in targeted spaces.
10. BLUEAIR Blue Pure 311i Max Smart Air Purifier for Medium
Best for: Automated smart smoke control.
With a powerful airflow that refreshes spaces up to 929 sq ft in 30 minutes, the BLUEAIR Blue Pure 311i Max quickly tackles smoke and airborne particles. Its HEPASilent dual filtration captures 99.97% of particles down to 0.1 microns, effectively removing smoke, dust, and allergens. Built-in sensors automatically adjust fan speed based on detected air quality, managing smoke levels proactively in medium rooms, apartments, and home offices. The purifier’s smart features and app control allow for convenient monitoring and operation, ensuring consistently clean air.
This BLUEAIR model refreshes 929 sq ft in 30 minutes using its HEPASilent dual filtration, which captures 99.97% of particles down to 0.1 microns, ideal for smoke and allergens. It operates quietly at 23 Decibels. The unit features built-in sensors for automatic air quality adjustment and offers app control via smart home compatibility (Alexa, Android, iOS). Its low 7.8-watt wattage makes it extremely energy-efficient for continuous use in medium rooms or home offices where smoke can be an issue.
Pros
- Cleans 929 sq ft in 30 minutes
- Captures 99.97% of particles down to 0.1 microns
- Smart sensors for automatic air quality adjustment
- Very low 7.8-watt power consumption
Cons
- The stated floor area of 1858 sq ft is for filter replacement cycles, not rapid cleaning performance.
For medium-sized rooms or apartments where smoke is a recurring concern, this smart BLUEAIR purifier offers automated, efficient air cleaning. Its combination of effective filtration and intelligent sensors makes it ideal for maintaining healthy air with minimal intervention.
Room Size and ACH: The Smoke Purifier Core Trade-Off
Selecting a true best air purifier for smoke hinges on aligning its Clean Air Delivery Rate (CADR) for smoke with the actual dimensions of the space you intend to purify, not just the manufacturer’s optimistic square footage claims. While brands like LEVOIT Air Purifier for Home Large Room Up to 1875 Ft² and PuroAir 240 HEPA Air Purifiers for Home Large Rooms both boast impressive coverage, the devil is in the details: look for the Air Changes per Hour (ACH) at a given room size, which indicates how quickly the unit can cycle and clean the air. A higher ACH means faster remediation of smoke particles.
Many consumers fixate on the maximum square footage a machine can theoretically cover, but this often ignores the practical reality of smoke infiltration. Smoke particles are incredibly fine and linger; a unit rated for a very large room but only achieving 2 ACH might still leave a noticeable smoky odor and particulate matter lingering for hours. Conversely, a model like the WINIX 5510 Air Purifier, while AHAM Verifide at 392 sq ft, offers multiple speed settings that, when run on high in a smaller space, provide an exceptionally high ACH, effectively turning over the air much faster and more efficiently tackling smoke than a lower-powered unit struggling in a large area.
This rapid air exchange is crucial for smoke removal.
Consider the LEVOIT Air Purifier for Home Allergies Pet Hair in Bedroom or the LEVOIT Air Purifier for Home Large Room Up to 1073Ft². While both are AHAM Verifide, their specified CADR ratings for smoke, dust, and pollen will differ. A higher CADR for smoke directly translates to better performance in smoke-heavy environments.
This is where models like the KNKA Air Purifier for Home Bedroom Large Room Up to 226 CFM, with its clearly stated Smoke/Dust/PM2.5 CADR, provide a more transparent performance metric that directly addresses smoke issues, far beyond a general room size recommendation.
The BLUEAIR Blue Pure 311i Max Smart Air Purifier for Medium Rooms, and indeed many purifiers on the market, employ advanced filtration systems, but without sufficient air movement, even the best filter can only do so much. The real performance gap, particularly for smoke, lies in the synergy between filter efficiency and the machine’s ability to move air. Models that achieve higher ACH in their recommended room sizes, or offer powerful high-speed settings for smaller spaces, will outperform their competitors when dealing with the pervasive challenge of smoke.
It’s about the rate of cleaning the entire volume of air, not just covering the floor space.
For intense smoke situations, prioritizing a unit with a demonstrably high smoke CADR and a strong ACH rating for your specific room size will yield the best results; the PuroAir 240 HEPA Air Purifiers for Home Large Rooms stands out if your primary concern is rapid smoke clearance in open areas.
What to Look For in the Best Air Purifier for Smoke
Room coverage and cleaning speed cadr
The Clean Air Delivery Rate (CADR), a standard established by the Association of Home Appliance Manufacturers (AHAM), directly impacts how quickly an air purifier can effectively clear smoke from your home. For instance, the KNKA model boasts a Smoke/Dust/PM2.5 CADR of 226 CFM, indicating its strong performance. Consider the sheer square footage you need to cover; the PuroAir 240 is designed for rooms up to 1,000 sq ft, able to achieve cleaner air in just one hour, while the LEVOIT large room models can handle areas up to 1,875 sq ft, and the BLUEAIR Pure Max series extends to an impressive 3,048 sq ft.
Some units, like the Afloia, emphasize a high number of Air Changes per Hour (ACH), offering 4 ACH for rooms up to 269 sq ft, ensuring rapid filtration. Others, such as the BLUEAIR Blue Pure 311i Max, promise efficiency by cleaning a 929 sq ft space in as little as 30 minutes.
Prioritize a CADR and room coverage specification that aligns with the size of the area prone to smoke to ensure rapid and thorough air purification.
Filtration technology and effectiveness
The effectiveness of an air purifier hinges on its filtration technology, especially when dealing with smoke. A True HEPA filter is crucial, as demonstrated by the WINIX 5510’s ability to capture 99.99% of airborne allergens. This means it can trap microscopic particles, including those that make up smoke, down to 0.3 microns.
Look for purifiers that specify this capability. Beyond HEPA, advanced multi-stage filtration systems, like the 3-Layer Filtration found in Afloia models, offer enhanced performance.
This layered approach often includes a pre-filter to catch larger particles and an activated carbon filter to target odors and Volatile Organic Compounds (VOCs) – essential for neutralizing the pervasive smell and harmful components of smoke. The PuroAir 240 HEPA Air Purifier, for instance, is engineered to clean rooms up to 1,000 sq ft, indicating a strong airflow and filtration capacity for effective smoke removal in larger spaces.
Smart features and connectivity
The WINIX 5510 offers app control, a key smart feature that enhances convenience and understanding of your home’s air quality. This functionality allows for remote operation, letting you adjust settings or turn the unit on and off from virtually anywhere, which is especially useful when you’re away from home and concerned about smoke lingering. Many smart air purifiers, including certain LEVOIT models like the Smart &, integrate with smart home ecosystems, enabling voice commands through platforms like Alexa or Google Assistant.
Imagine asking your assistant to activate the air purifier at 2026 CFM just as you detect smoke. Furthermore, these apps provide real-time air quality monitoring, displaying detailed information about pollutants such as PM2.5, giving you immediate feedback and peace of mind.
This continuous data stream helps you understand the impact of smoke and the purifier’s effectiveness in real-time.
Noise levels and design
The BLUEAIR Blue Pure 311i Max boasts a design that is 50% less noise compared to other models in its line, aiming for a quieter operation. Understanding noise levels is crucial, especially if the air purifier will be in a bedroom or living area. While specific decibel (dB) ratings at various fan speeds aren’t always prominent, many units offer a whisper-quiet mode, sometimes as low as 23 dB like some LEVOIT models for bedrooms.
Consider the physical dimensions too; a compact unit, perhaps around 10 x 10 x 15 inches, can easily fit on a nightstand or shelf, while larger models like the PuroAir 240, designed for rooms up to 1,000 sq ft, will require dedicated floor space. Ensuring a good fit for your room’s layout prevents it from becoming an obstruction or an eyesore.
Quick Best Air Purifier For Smoke Buying Checklist
- CADR Rating: Look for a Clean Air Delivery Rate (CADR) of at least 200-300 for smoke to ensure effective air cleaning in medium to large rooms.
- HEPA Filter Type: Ensure it uses a True HEPA filter, which captures 99.97% of airborne particles, including smoke and allergens, down to 0.3 microns.
- Activated Carbon Filter: Prioritize models with a substantial activated carbon filter, as this is crucial for absorbing odors associated with smoke.
- Coverage Area: Match the purifier’s square footage coverage to the size of the room you intend to use it in for optimal performance.
- Noise Level (dB): Consider the decibel (dB) rating, especially if placing it in a bedroom or living area, aiming for models under 50 dB on lower settings.
- Filter Replacement Cost & Frequency: Factor in the ongoing cost and how often you’ll need to replace filters, as this is a significant long-term expense.
Frequently Asked Questions
What Type Of Filter Is Most Effective For Removing Smoke Particles From The Air?
HEPA (High-Efficiency Particulate Air) filters are most effective for removing smoke particles from the air due to their ability to capture at least 99.97% of airborne particles measuring 0.3 micrometers in diameter. This includes the very fine particulate matter that constitutes smoke.
How Quickly Can An Air Purifier Clear Smoke From A Room?
An air purifier can clear smoke from a room rapidly, often within minutes to an hour, depending on the unit’s CADR (Clean Air Delivery Rate) and room size. Higher CADR ratings indicate more efficient air cleaning, effectively removing smoke particles and odors faster.
Which Air Purifiers Are Best Suited For Tackling Wildfire Smoke Or Heavy-Duty Smoke Situations?
For tackling wildfire smoke or heavy-duty smoke situations, air purifiers with **True HEPA filters are best suited**. These filters are highly effective at capturing fine particulate matter, which is the primary component of smoke. Look for units with activated carbon pre-filters to further absorb odor and gaseous pollutants.
Are There Specific Features To Look For In An Air Purifier To Combat Lingering Smoke Odors?
Yes, effective air purifiers for lingering smoke odors require a substantial activated carbon filter designed to absorb volatile organic compounds. Look for a high CADR (Clean Air Delivery Rate) for smoke, indicating its ability to quickly clean a room. HEPA filters, while crucial for particulate matter, are secondary to the carbon for odor elimination.
Can An Air Purifier Effectively Remove Smoke From Vaping Or Cooking, In Addition To Traditional Smoke?
Yes, air purifiers can effectively remove smoke from vaping and cooking, alongside traditional smoke. This efficacy hinges on the purifier’s filtration system, specifically its activated carbon filter’s ability to adsorb the volatile organic compounds and particulate matter characteristic of all smoke types.
Final Words
Investing in a top-tier air purifier is a powerful step towards cleaner, healthier indoor air, effectively tackling smoke and other airborne irritants. Beyond smoke removal, these devices offer comprehensive air purification for a more comfortable living environment, making them an invaluable addition to any home. Take control of your air quality today and breathe easier, knowing you’re creating a sanctuary free from unwanted odors and pollutants.