diff --git a/src/Resource/AirPollutionResource.php b/src/Resource/AirPollutionResource.php
index 7400468..7a1ff14 100644
--- a/src/Resource/AirPollutionResource.php
+++ b/src/Resource/AirPollutionResource.php
@@ -5,14 +5,11 @@
 use ProgrammatorDev\Api\Method;
 use ProgrammatorDev\OpenWeatherMap\Entity\AirPollution\AirPollution;
 use ProgrammatorDev\OpenWeatherMap\Entity\AirPollution\AirPollutionCollection;
-use ProgrammatorDev\OpenWeatherMap\Resource\Util\ValidationTrait;
 use ProgrammatorDev\Validator\Exception\ValidationException;
 use Psr\Http\Client\ClientExceptionInterface;
 
 class AirPollutionResource extends Resource
 {
-    use ValidationTrait;
-
     /**
      * @throws ValidationException
      * @throws ClientExceptionInterface
diff --git a/src/Resource/GeocodingResource.php b/src/Resource/GeocodingResource.php
index fa8ef48..c0539ba 100644
--- a/src/Resource/GeocodingResource.php
+++ b/src/Resource/GeocodingResource.php
@@ -5,7 +5,6 @@
 use ProgrammatorDev\Api\Method;
 use ProgrammatorDev\OpenWeatherMap\Entity\Geocoding\ZipLocation;
 use ProgrammatorDev\OpenWeatherMap\Entity\Location;
-use ProgrammatorDev\OpenWeatherMap\Resource\Util\ValidationTrait;
 use ProgrammatorDev\OpenWeatherMap\Util\EntityTrait;
 use ProgrammatorDev\Validator\Exception\ValidationException;
 use Psr\Http\Client\ClientExceptionInterface;
@@ -13,7 +12,6 @@
 class GeocodingResource extends Resource
 {
     use EntityTrait;
-    use ValidationTrait;
 
     private const NUM_RESULTS = 5;
 
diff --git a/src/Resource/Resource.php b/src/Resource/Resource.php
index d17aef8..b9f59e7 100644
--- a/src/Resource/Resource.php
+++ b/src/Resource/Resource.php
@@ -4,10 +4,12 @@
 
 use ProgrammatorDev\OpenWeatherMap\OpenWeatherMap;
 use ProgrammatorDev\OpenWeatherMap\Resource\Util\CacheTrait;
+use ProgrammatorDev\OpenWeatherMap\Resource\Util\ValidationTrait;
 
 class Resource
 {
     use CacheTrait;
+    use ValidationTrait;
 
     public function __construct(protected OpenWeatherMap $api) {}
 }
\ No newline at end of file
diff --git a/src/Resource/Util/ValidationTrait.php b/src/Resource/Util/ValidationTrait.php
index 382ce7c..33dd7d6 100644
--- a/src/Resource/Util/ValidationTrait.php
+++ b/src/Resource/Util/ValidationTrait.php
@@ -12,7 +12,7 @@ trait ValidationTrait
     /**
      * @throws ValidationException
      */
-    private function validateQuery(string $query, string $name): void
+    protected function validateQuery(string $query, string $name): void
     {
         Validator::notBlank()->assert($query, $name);
     }
@@ -20,7 +20,7 @@ private function validateQuery(string $query, string $name): void
     /**
      * @throws ValidationException
      */
-    private function validatePositive(int $number, string $name): void
+    protected function validatePositive(int $number, string $name): void
     {
         Validator::greaterThan(0)->assert($number, $name);
     }
@@ -28,7 +28,7 @@ private function validatePositive(int $number, string $name): void
     /**
      * @throws ValidationException
      */
-    private function validateCoordinate(float $latitude, float $longitude): void
+    protected function validateCoordinate(float $latitude, float $longitude): void
     {
         Validator::range(-90, 90)->assert($latitude, 'latitude');
         Validator::range(-180, 180)->assert($longitude, 'longitude');
@@ -37,7 +37,7 @@ private function validateCoordinate(float $latitude, float $longitude): void
     /**
      * @throws ValidationException
      */
-    private function validateCountryCode(string $countryCode): void
+    protected function validateCountryCode(string $countryCode): void
     {
         Validator::country()->assert($countryCode, 'countryCode');
     }
@@ -45,7 +45,7 @@ private function validateCountryCode(string $countryCode): void
     /**
      * @throws ValidationException
      */
-    private function validateLanguage(string $language): void
+    protected function validateLanguage(string $language): void
     {
         Validator::choice(Language::getOptions())->assert($language, 'language');
     }
@@ -53,7 +53,7 @@ private function validateLanguage(string $language): void
     /**
      * @throws ValidationException
      */
-    private function validateUnitSystem(string $unitSystem): void
+    protected function validateUnitSystem(string $unitSystem): void
     {
         Validator::choice(UnitSystem::getOptions())->assert($unitSystem, 'unitSystem');
     }
@@ -61,7 +61,7 @@ private function validateUnitSystem(string $unitSystem): void
     /**
      * @throws ValidationException
      */
-    private function validateDateOrder(\DateTimeInterface $startDate, \DateTimeInterface $endDate): void
+    protected function validateDateOrder(\DateTimeInterface $startDate, \DateTimeInterface $endDate): void
     {
         Validator::greaterThan(
             constraint: $startDate,
diff --git a/src/Resource/WeatherResource.php b/src/Resource/WeatherResource.php
index 66803a4..73ba121 100644
--- a/src/Resource/WeatherResource.php
+++ b/src/Resource/WeatherResource.php
@@ -7,7 +7,6 @@
 use ProgrammatorDev\OpenWeatherMap\Entity\Weather\WeatherCollection;
 use ProgrammatorDev\OpenWeatherMap\Resource\Util\LanguageTrait;
 use ProgrammatorDev\OpenWeatherMap\Resource\Util\UnitSystemTrait;
-use ProgrammatorDev\OpenWeatherMap\Resource\Util\ValidationTrait;
 use ProgrammatorDev\Validator\Exception\ValidationException;
 use Psr\Http\Client\ClientExceptionInterface;
 
@@ -15,7 +14,6 @@ class WeatherResource extends Resource
 {
     use LanguageTrait;
     use UnitSystemTrait;
-    use ValidationTrait;
 
     private const NUM_RESULTS = 40;
 
diff --git a/tests/Unit/AirPollution/AirPollutionCollectionTest.php b/tests/Unit/AirPollution/AirPollutionCollectionTest.php
new file mode 100644
index 0000000..f7757a9
--- /dev/null
+++ b/tests/Unit/AirPollution/AirPollutionCollectionTest.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace ProgrammatorDev\OpenWeatherMap\Test\Unit\AirPollution;
+
+use ProgrammatorDev\OpenWeatherMap\Entity\AirPollution\AirPollutionCollection;
+use ProgrammatorDev\OpenWeatherMap\Entity\AirPollution\AirPollutionData;
+use ProgrammatorDev\OpenWeatherMap\Entity\Coordinate;
+use ProgrammatorDev\OpenWeatherMap\Test\AbstractTest;
+
+class AirPollutionCollectionTest extends AbstractTest
+{
+    public function testMethods()
+    {
+        $entity = new AirPollutionCollection([
+            'coord' => [
+                'lat' => 50,
+                'lon' => 50
+            ],
+            'list' => [
+                [
+                    'dt' => 1715279409,
+                    'main' => [
+                        'aqi' => 1
+                    ],
+                    'components' => [
+                        'co' => 100,
+                        'no' => 0,
+                        'no2' => 1,
+                        'o3' => 100,
+                        'so2' => 1,
+                        'pm2_5' => 1,
+                        'pm10' => 1,
+                        'nh3' => 1
+                    ]
+                ]
+            ]
+        ]);
+
+        $this->assertInstanceOf(Coordinate::class, $entity->getCoordinate());
+        $this->assertContainsOnlyInstancesOf(AirPollutionData::class, $entity->getData());
+    }
+}
\ No newline at end of file
diff --git a/tests/Unit/AirPollution/AirPollutionDataTest.php b/tests/Unit/AirPollution/AirPollutionDataTest.php
new file mode 100644
index 0000000..68da780
--- /dev/null
+++ b/tests/Unit/AirPollution/AirPollutionDataTest.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace ProgrammatorDev\OpenWeatherMap\Test\Unit\AirPollution;
+
+use ProgrammatorDev\OpenWeatherMap\Entity\AirPollution\AirPollutionData;
+use ProgrammatorDev\OpenWeatherMap\Entity\AirPollution\AirQuality;
+use ProgrammatorDev\OpenWeatherMap\Test\AbstractTest;
+
+class AirPollutionDataTest extends AbstractTest
+{
+    public function testMethods()
+    {
+        $entity = new AirPollutionData([
+            'dt' => 1715279409,
+            'main' => [
+                'aqi' => 1
+            ],
+            'components' => [
+                'co' => 100,
+                'no' => 0,
+                'no2' => 1,
+                'o3' => 100,
+                'so2' => 1,
+                'pm2_5' => 1,
+                'pm10' => 1,
+                'nh3' => 1
+            ]
+        ]);
+
+        $this->assertInstanceOf(\DateTimeImmutable::class, $entity->getDateTime());
+        $this->assertInstanceOf(AirQuality::class, $entity->getAirQuality());
+        $this->assertSame(100.0, $entity->getCarbonMonoxide());
+        $this->assertSame(0.0, $entity->getNitrogenMonoxide());
+        $this->assertSame(1.0, $entity->getNitrogenDioxide());
+        $this->assertSame(100.0, $entity->getOzone());
+        $this->assertSame(1.0, $entity->getSulphurDioxide());
+        $this->assertSame(1.0, $entity->getFineParticulateMatter());
+        $this->assertSame(1.0, $entity->getCoarseParticulateMatter());
+        $this->assertSame(1.0, $entity->getAmmonia());
+    }
+}
\ No newline at end of file
diff --git a/tests/Unit/AirPollution/AirPollutionTest.php b/tests/Unit/AirPollution/AirPollutionTest.php
new file mode 100644
index 0000000..76902f7
--- /dev/null
+++ b/tests/Unit/AirPollution/AirPollutionTest.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace ProgrammatorDev\OpenWeatherMap\Test\Unit\AirPollution;
+
+use ProgrammatorDev\OpenWeatherMap\Entity\AirPollution\AirPollution;
+use ProgrammatorDev\OpenWeatherMap\Entity\AirPollution\AirQuality;
+use ProgrammatorDev\OpenWeatherMap\Entity\Coordinate;
+use ProgrammatorDev\OpenWeatherMap\Test\AbstractTest;
+
+class AirPollutionTest extends AbstractTest
+{
+    public function testMethods()
+    {
+        $entity = new AirPollution([
+            'coord' => [
+                'lat' => 50,
+                'lon' => 50
+            ],
+            'list' => [
+                [
+                    'dt' => 1715279409,
+                    'main' => [
+                        'aqi' => 1
+                    ],
+                    'components' => [
+                        'co' => 100,
+                        'no' => 0,
+                        'no2' => 1,
+                        'o3' => 100,
+                        'so2' => 1,
+                        'pm2_5' => 1,
+                        'pm10' => 1,
+                        'nh3' => 1
+                    ]
+                ]
+            ]
+        ]);
+
+        $this->assertInstanceOf(Coordinate::class, $entity->getCoordinate());
+        $this->assertInstanceOf(\DateTimeImmutable::class, $entity->getDateTime());
+        $this->assertInstanceOf(AirQuality::class, $entity->getAirQuality());
+        $this->assertSame(100.0, $entity->getCarbonMonoxide());
+        $this->assertSame(0.0, $entity->getNitrogenMonoxide());
+        $this->assertSame(1.0, $entity->getNitrogenDioxide());
+        $this->assertSame(100.0, $entity->getOzone());
+        $this->assertSame(1.0, $entity->getSulphurDioxide());
+        $this->assertSame(1.0, $entity->getFineParticulateMatter());
+        $this->assertSame(1.0, $entity->getCoarseParticulateMatter());
+        $this->assertSame(1.0, $entity->getAmmonia());
+    }
+}
\ No newline at end of file
diff --git a/tests/Unit/AirPollution/AirQualityTest.php b/tests/Unit/AirPollution/AirQualityTest.php
new file mode 100644
index 0000000..cae7f29
--- /dev/null
+++ b/tests/Unit/AirPollution/AirQualityTest.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace ProgrammatorDev\OpenWeatherMap\Test\Unit\AirPollution;
+
+use ProgrammatorDev\OpenWeatherMap\Entity\AirPollution\AirQuality;
+use ProgrammatorDev\OpenWeatherMap\Test\AbstractTest;
+
+class AirQualityTest extends AbstractTest
+{
+    public function testMethods()
+    {
+        $entity = new AirQuality([
+            'aqi' => 1
+        ]);
+
+        $this->assertSame(1, $entity->getIndex());
+        $this->assertSame('Good', $entity->getQualitativeName());
+    }
+}
\ No newline at end of file