Why You Need a PM2.5 App on Your Phone
PM2.5 — particulate matter smaller than 2.5 microns — causes long-term health effects even without immediate symptoms. Prolonged exposure above 50 μg/m³ increases the risk of respiratory disease, heart disease, and stroke. Bangkok faces more than 150 days per year where PM2.5 exceeds WHO's 24-hour standard of 15 μg/m³ during dry season.
A good PM2.5 app enables instant decisions: Should I wear an N95 mask today? Should I exercise indoors or outdoors? Do I need to run the air purifier right now?
Air4Thai: The Official Standard from Thailand's Pollution Control Department
Air4Thai is the official app from the Pollution Control Department (PCD) under Thailand's Ministry of Natural Resources and Environment. Data comes from government-installed monitoring stations nationwide.
Key features include hourly air quality data and 7-day historical records, color-coded severity graphs using the Thai AQI index, and a nationwide air quality map. Best for those needing an official reference standard. Available free on both App Store and Play Store.
IQAir AirVisual: Global Coverage with 7-Day Forecast
IQAir AirVisual is the most widely used professional-grade air quality app globally. It displays AQI using the US Standard for international comparison, with 7-day forecasts and complete data on PM2.5, PM10, O3, NO2, SO2, and CO. Coverage spans 10,000+ cities worldwide — ideal for travelers and those wanting internationally comparable data.
Users with IQAir indoor sensors can connect them to the app for real-time Indoor vs Outdoor comparisons.
Airveda: Detailed Multi-Parameter Data for Health-Focused Users
Airveda excels by displaying multiple parameters on a single screen: PM2.5, PM10, CO2, VOC, temperature, and humidity — both indoors and outdoors. Trend graphs show air quality changes over time, and the app connects to Airveda's own sensors for accurate indoor measurements. Best for allergy sufferers, asthma patients, or anyone focused on indoor air quality.
BreezoMeter: Location-Precise with Pollen Data
BreezoMeter uses Machine Learning algorithms combining data from nearby monitoring stations to estimate PM2.5 at your precise location more accurately than other apps. Its unique advantage is pollen data — tree, grass, and weed pollen counts — highly valuable for allergy sufferers. It also sends alerts when local air quality shifts significantly.
Air Matters: 180+ Countries for Frequent Travelers
Air Matters covers 180+ countries worldwide, features a Ranking system showing which cities have the best and worst air quality at any moment, and automatically alerts you when entering high-pollution areas. Perfect for frequent domestic and international travelers.
Which App Should You Choose?
Simple guide: Air4Thai for official Thai standards, IQAir AirVisual for comprehensive data and long-range forecasting, Airveda for indoor air quality, BreezoMeter for location-precise data and pollen, and Air Matters for travelers. That said, pairing a quality home air purifier with a PM2.5 monitoring app delivers the most comprehensive protection.